check for a collection on connecting to server

I’m running a prophunt server and made a collection with all required items for players in my server, instead of actually using fastdl for players to download everything. Partially because there is quite a fair bit of content to download and it would take for ever to get.

Every so often, usually when a new player joins they complain about seeing big red errors because they dont have my collection. Which can be annoying at times.

My question is, Is there a way to check to see if a player connecting has my collection installed? And if not, show them where to get it from?