@sh-user
You should see gcc-10.3
Snapshot and alpha release are not officially supported by arduino and I sometimes see the same issue as you see, or some other times a java.nullpointer.exception.
In this case, what works is to remove esp8266\ in C:\Users\name\AppData\Local\Arduino15\Packages\ before installing 0.0.1 or 0.0.2 again.
BTW, a new updated gcc-10.3 version has just landed in alpha release v0.0.2 that I'm about to try with windows.

edit: the new gcc10.3 works (long first compilation, short second compilation, flash& run OK from windows)
edit2: it is now in the snapshot release too (0.0.1)