Hello! I've seen a multitude of comments complaining/asking about joining the server!
Here is the process (as far as I know)
First, enable downloads from server. It's somewhere in the options menu, probably in advanced options.
Then you are going to want to download the zip files (ALL OF THEM) from the Server File Direct Downloads thread, which is right here: https://steamhost.cn/steamcommunity_com/groups/ctf2w/discussions/0/521643320369769888/

Then you place them in this folder: C:\Program Files(x86)\Steam\steamapps\common\Team Fortress 2\tf\download\[FILES GO HERE]

And as for the crashing upon joining servers, I don't have a clue.
If an admin/moderator wants to elaborate on this, it'd be welcomed.

Anyways, those are the first steps you need to do before joining the servers.