Windows version 8.1 and problems

Hi to all.
I used Windows 7 for long time and i never had problems with manycams. Later i changed with Windows 8.1. After this date i have this problem:
I Always use manycam in old version for game and effect video in sites as chatrandom, omegle, chatroulette and similar. I rename manycam (for take off the inscription “simulated webcam”), i enter in chat, i click in the new manycam name but i watch always my face or the manycam logo… may be manycam old version is not compatible with Windows 8.1 about the rename option? Someone has idea what i can do? Many many thanks.