Hi all
I have just tried to install the beta 9 version on Win 10 64bit and get a host (maybe 50+) of "path too long" errors.
I tried Winzip and it failed with the errors, tried Windows native extract and it also failed with those errors.
I've tried shortening the destination folder title to no avail.
From reading that thread, I see that the Arduino IDE 2.x developer suggested that an installer would help with the issue. At the time of that conversation, Arduino IDE 2.x did not have a Windows installer yet. So, if you haven't already, try using the "Windows Win 10 and newer, 64 bits" download from the software page: