Teensyduino 1.57 problem

Hi there,

I was very excited to install the new Arduino 2.0.0 IDE yesterday while still using my old trusted 1.8.8 because that's what I'm used to.
HOWEVER as soon as I installed the new Teensyuiono 1.57 I suddenly I couldn't compile anything on the old IDE.
I tried to uninstall the 2.0.0 IDE but I'm still stuck. Now I'm trying to uninstall the 1.57 but I can't find an easy way to do that either. Please help me someone as it feels like things have irresversibly changed!!!

Here are my error codes I'm getting on the 1.8.8 when I try and compile:
********************************************************
Arduino: 1.8.8 (Windows 10), TD: 1.50, Board: "Teensy 4.0, Serial, 600 MHz, Faster, US English"

Skipping C:\Users\user\AppData\Local\Arduino15\packages\teensy\tools\teensy-compile\5.4.1\avr\builtin_tools_versions.txt; please consider removing that file since it may hurt older Arduino installations
WARNING: Category 'Utility' in library FlexIO_t4 is not valid. Setting to 'Uncategorized'
Multiple libraries were found for "MapFloat.h"
C:\Users\user\Documents\Arduino\libraries\SdFat\SdSpiMK20DX128.cpp:23:23: fatal error: mk20dx128.h: No such file or directory

Used: C:\Users\user\Documents\Arduino\libraries\MapFloat
compilation terminated.

Not used: C:\Users\user\Documents\Arduino\libraries\MapFloat-master
Multiple libraries were found for "Audio.h"
Used: C:\Users\user\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.57.0\libraries\Audio
Not used: C:\Users\user\Documents\Arduino\libraries\Audio
Multiple libraries were found for "SD.h"
Used: C:\Users\user\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.57.0\libraries\SD
Not used: C:\Program Files (x86)\Arduino\libraries\SD
Multiple libraries were found for "SdFat.h"
Used: C:\Users\user\Documents\Arduino\libraries\SdFat
Not used: C:\Users\user\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.57.0\libraries\SdFat
Not used: C:\Program Files (x86)\Arduino\libraries\SdFat
Multiple libraries were found for "SerialFlash.h"
Used: C:\Users\user\Documents\Arduino\libraries\SerialFlash
Not used: C:\Users\user\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.57.0\libraries\SerialFlash
Error compiling for board Teensy 4.0.
Invalid library found in C:\Program Files (x86)\Arduino\libraries\amd64: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\amd64
Invalid library found in C:\Program Files (x86)\Arduino\libraries\AudioAnalyzer: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\AudioAnalyzer
Invalid library found in C:\Program Files (x86)\Arduino\libraries\ia64: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\ia64
Invalid library found in C:\Program Files (x86)\Arduino\libraries\license: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\license
Invalid library found in C:\Program Files (x86)\Arduino\libraries\Microsmooth-master: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\Microsmooth-master
Invalid library found in C:\Program Files (x86)\Arduino\libraries\music_v1_14: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\music_v1_14
Invalid library found in C:\Program Files (x86)\Arduino\libraries\SdFat_master: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\SdFat_master
Invalid library found in C:\Program Files (x86)\Arduino\libraries\Spectrum_Shield_Driver_master: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\Spectrum_Shield_Driver_master
Invalid library found in C:\Program Files (x86)\Arduino\libraries\x86: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\x86
Invalid library found in C:\Program Files (x86)\Arduino\libraries\__MACOSX: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\__MACOSX
Invalid library found in C:\Users\user\Documents\Arduino\libraries\amd64: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\amd64
Invalid library found in C:\Users\user\Documents\Arduino\libraries\AudioAnalyzer: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\AudioAnalyzer
Invalid library found in C:\Users\user\Documents\Arduino\libraries\ia64: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\ia64
Invalid library found in C:\Users\user\Documents\Arduino\libraries\license: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\license
Invalid library found in C:\Users\user\Documents\Arduino\libraries\Microsmooth-master: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\Microsmooth-master
Invalid library found in C:\Users\user\Documents\Arduino\libraries\music_v1_14: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\music_v1_14
Invalid library found in C:\Users\user\Documents\Arduino\libraries\SdFat_master: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\SdFat_master
Invalid library found in C:\Users\user\Documents\Arduino\libraries\Spectrum_Shield_Driver_master: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\Spectrum_Shield_Driver_master
Invalid library found in C:\Users\user\Documents\Arduino\libraries\x86: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\x86
Invalid library found in C:\Users\user\Documents\Arduino\libraries\__MACOSX: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\__MACOSX
Invalid library found in C:\Program Files (x86)\Arduino\libraries\amd64: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\amd64
Invalid library found in C:\Program Files (x86)\Arduino\libraries\AudioAnalyzer: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\AudioAnalyzer
Invalid library found in C:\Program Files (x86)\Arduino\libraries\ia64: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\ia64
Invalid library found in C:\Program Files (x86)\Arduino\libraries\license: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\license
Invalid library found in C:\Program Files (x86)\Arduino\libraries\Microsmooth-master: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\Microsmooth-master
Invalid library found in C:\Program Files (x86)\Arduino\libraries\music_v1_14: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\music_v1_14
Invalid library found in C:\Program Files (x86)\Arduino\libraries\SdFat_master: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\SdFat_master
Invalid library found in C:\Program Files (x86)\Arduino\libraries\Spectrum_Shield_Driver_master: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\Spectrum_Shield_Driver_master
Invalid library found in C:\Program Files (x86)\Arduino\libraries\x86: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\x86
Invalid library found in C:\Program Files (x86)\Arduino\libraries\__MACOSX: no headers files (.h) found in C:\Program Files (x86)\Arduino\libraries\__MACOSX
Invalid library found in C:\Users\user\Documents\Arduino\libraries\amd64: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\amd64
Invalid library found in C:\Users\user\Documents\Arduino\libraries\AudioAnalyzer: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\AudioAnalyzer
Invalid library found in C:\Users\user\Documents\Arduino\libraries\ia64: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\ia64
Invalid library found in C:\Users\user\Documents\Arduino\libraries\license: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\license
Invalid library found in C:\Users\user\Documents\Arduino\libraries\Microsmooth-master: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\Microsmooth-master
Invalid library found in C:\Users\user\Documents\Arduino\libraries\music_v1_14: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\music_v1_14
Invalid library found in C:\Users\user\Documents\Arduino\libraries\SdFat_master: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\SdFat_master
Invalid library found in C:\Users\user\Documents\Arduino\libraries\Spectrum_Shield_Driver_master: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\Spectrum_Shield_Driver_master
Invalid library found in C:\Users\user\Documents\Arduino\libraries\x86: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\x86
Invalid library found in C:\Users\user\Documents\Arduino\libraries\__MACOSX: no headers files (.h) found in C:\Users\user\Documents\Arduino\libraries\__MACOSX

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
 
Looking at your output looks like you have TD 1.50 installed:
Code:
Arduino: 1.8.8 (Windows 10), TD: 1.50, Board: "Teensy 4.0, Serial, 600 MHz, Faster, US English"

Would suggest that you double check that you actually downloaded and installed 1.57.

Second thing is I would delete
Code:
C:\Users\user\AppData\Local\Arduino15\packages\teensy\
directory just to have a clean install.

Then try to recompile.
 
Install Teensyduino 1.57.

This is a known issue with 1.56 and earlier, where having an Arduino IDE 2.0.0 install on the same PC interferes with Arduino 1.8.x using Teensyduino 1.56 or earlier.

Teensyduino 1.57 added support so to work on Arduino 1.8.x without interference from IDE 2.

If you really must use an earlier version of Teensyduino, it is possible if you put Arduino 1.8.x into "portable" mode. This needs to be done on a freshly extracted copy of Arduino 1.8.x. After you create the portable folder, then run the (older than 1.57) Teensyduino installer and point it at that portable copy. The installer will notice it's in portable mode and install appropriately. Portable mode makes a copy of Arduino IDE completely self contained.
 
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