Could you check these paths?
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Eastern Front
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{97AFD0D8-5720-4A59-BFDC-CB92A36FADF9}_is1
In either case, if this doesn't work, at least by now you can run Eastern Front(but you will have to update manually).