I'll go ahead and post how, in case you (or anyone else) wants to ignore any update, including this one.
First, the simplest way, is to delete it (if you never use the plugin). If the plugin is not in the mq2 directory, then automatic updates won't offer to update it for you. You could still see it if you "Check For Updates" from the tray (it won't be automatically selected, but you can check it on).
Second, is you can configure loader to ignore certain updates always. Edit (or create) MMOLoader.ini in your MQ2 dir, and any plugin listed under [Date_Exclusions] that is non-zero, will be ignored - always.
Example:
[Date_Exclusions]
MQ2AASpend.dll=1
Third, you could turn off automatic updates entirely. It would be best not to, but that's up to you. You just add patchme on the end of the command for loader, just like you would for eqgame. Example: C:\MQ2\MMOLoader.exe patchme
htw