Issue changing announcer packs?

So for a while I was using a certain announcer pack and lately have been wanting to change it to something else, but the issue I have is the downloads for the packs are not the same file type as the original announcer and I have no idea what to do because it seems no one else has this issue or at least reported about it.

The file types I'm having issues with are the original announcer being .bnk and the downloaded ones are .wpk, it seems Riot issued a patch a little while back that changed the file type but the pack I had at the time seemed to be unaffected, idk why.

If anyone has any tips or ideas I'll be grateful, thanks!