in registery the version is 9.0.0.0000 and i think if i set to the 10.0.0.1270 wont happen anything ... but i dont have to risk

It was said it doesn't work if the registry key is set to 10.0. I don't remember now if it's an HyperIM bug or a Y!M bug. You could try changing that, see if it works or not, then report back.
EDIT (for Codename): I think the Y!M Plugin for HyperIM needs a small change, at least to update the text for Y!M Messenger versions

It is stuck on Y!M 9.0 Beta. Remove "Beta" and add 10.0 too. Small change, it shouldn't take time
