Help me find a Mod

[BioFall]

I am looking for a mod for a new forum I am looking for.

Attachment Limit - So far I've found Limit Attachment Downloads , but that's for 6.8 and I have 8.4 (not sure if its compatable or not).

Anyways I am planning on making it cost moneys to download attachments, so that for example one download would cost $10 or you could get a one year subscription for unlimited downloads.

I wasn't able to find anything that does this, but I'm just seeing if you guys know of a mod that does this.