For those who suddenly received reports from Avira last week that "getfullversion.exe" from The Mysterious Past of Gregory Phoenix, it is a false positive.
I reported it to Avira less than an hour after receiving the notice myself and just got the results of "False Positive". It will be fixed within a few days if things go as normal.
As further information - as far as I can tell, the game is not needed. You can change the shortcut to use GregoryPhoenix.exe instead (it's the one with the icon).
Diane