Do you experience problems during downloading?
Check your connection in Status and Interface settings window.
Use Test Server in Config > Servers.
We will probably ask you to do a test using only basic settings.
Do you experience problems during repair or unpacking?
Enable +Debug logging in the Status and Interface settings window and share the relevant parts of the log here using [ code ] sections.
Just verified and works on Windows 10 just fine.
It's not accepted for Temporary download folder indeed, it wasn't in 0.7.20 either.
EDIT: I see now that on 0.7.20 you could input UNC paths for the temp-folder and hit save, and it won't give an error even though it won't actually save it.
EDIT2: Also tested on Win7, also works to input it and to actually download something.
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Please close... my bad... seems like the server decided just when I did the upgrade to 1.0 rc4 to have trust issues with my domain. ARGH.. I hate windows....