I have messenger 2009 and messenger plus! 4.9 and Batman won't work when i download. It gives me that message about it "not being a valid messenger skin pack". Darn, I previously had it when it was for messenger 8.5. It was the best looking skin ever.

Try clearing your web browsers cache, then downloading.

Instructions: Clear Your Browser's Cache - wikiHow

I already did that, but to no avail.

Maybe it's not compatible.

The Batman skin is compatible with version 2009 only, which he says he has.

Not sure how he previously had it for the 8.5 version though.

There have been connection issues for some users when downloading skins from the Messenger Plus! skins website.

The skin is definitely compatible for Messenger 2009, when the "invalid skin pack" message comes up it means that you have not downloaded the full skin package.

All you can do is keep retrying the download until you finally do get the full package.

I finally have it done. I did nothing new but I just tried another day and it worked.