Ah, thank you for reporting this. I was able to verify this problem and have fixed it for the next upload (soon).
No need to run any of this as an admin from my experience, except driver installation, but I added a workaround for the admin issue. As for the admin problem, it might be a "bug" with the way Windows launches batch files as Administrator... one which I've grown accustomed to. It does not maintain the working directory (changes it to %SYSTEMROOT%\system32 if I recall correctly) which breaks most batch scripts that expect to be executing in their own directory. It looks like they work OK out of the box in 8.1 if they have the .cmd extension, but I may have fixed it myself already and forgot.
Way off-topic, but if you want to actually fix that Windows problem so other scripts will also work OK running as admin, you can navigate in regedit to HKEY_CLASSES_ROOT\batfile\shell\runas\command (and later cmdfile, too) and change the (Default) value...
Code:
from: %SystemRoot%\System32\cmd.exe /C "%1" %*
to: %SystemRoot%\System32\cmd.exe /s /c pushd "%w" && "%1" %* && popd