SparkFun

Teensyduino 1.61 has been released https://www.pjrc.com/teensy/td_download.html Support for Arduino IDE 2.0.4 and later is available by adding this package index URL in File > Preferences. https://www.pjrc.com/teensy/package_teensy_index.json...

It's much easier if you solder the chip before adding header pins or wires. Best to run the memory test program to confirm it's really working before adding other stuff that blocks easy access to the chip.

It also looks like 4.1 is available in your region from TinyTronics: https://www.tinytronics.nl/en/development-boards/microcontroller-boards/teensy/teensy-4.1