A least a couple people have reported a problem where the installer runs in some strange mode where it can't access stuff in C:\Program Files, even though it's able to see the files. So far, I don't fully understand why this happens. Really hoping you can help with some feedback when this get solved?
The best guess so far is running the installer directly from downloading by Internet Explorer puts it in this strange mode. (but this is guessing backed on really vague comments from only 1 person... very hard to get people to tell us any reliable info when they get this working)
If you're letting IE run it automatically, please save the installer, then run it. Does that help? If not, try running by right clicking and choose to run as admin. But please try the non-admin run by clicking on it from your Downloads folder. Any insight about which ways do & don't work could really help us to help everyone else in the future.
Please also let us know which version & build of Windows you have. To check on Windows 10, click the Start button, then the Settings icon, then System, and About. Scroll down to "Windows specifications" and it should show "Version". My my Windows 10 test machine Version shows "1709" and OS Build shows "16299.371".