Indeed, it is a known issue.. for now we've resorted to moderating people who abuse this issue -but I'll admit that this isn't really a solution.

I'll have to find some time to actually come up with a proper fix/mechanism that doesn't impact the upgrade system or the actual missions.

For now it'll be good to know on which maps and missions this is a real issue. Also if anyone actively blocks the mission you're free to call a kickvote against them, or report them to me or Funky.

For the best experience, we recommend you to allow all custom files from our servers, this is required in order for Hyper Upgrades to work properly.

To do this:

1. Open Team Fortress 2 options
   
2. Navigate to the "Multiplayer" tab
   
3. Make sure download is set to "Allow all custom files" or "no custom sounds"
   
4. Hit apply and close the window
   
5. Reconnect to the server to download necessary files

It should look something like:
https://gtm.you1.cn/sharedfiles/filedetails/?id=2919210580

(If you are not planning to play on our Hyper Upgrades servers, than you can set this option to "maps only")

We strive to be as free and open as possible, without annoying ads, popups or VIP subscriptions.

That's why we appreciate your support, in the form of a one-time donation!

Send a single trade offer with 8 Refined Metal (or more) to Space using the following button:

https://steamcommunity.com/tradeoffer/new/?partner=159112061&token=ocpRh9Bl

Don't forget to add your Discord username in the offer to receive the Donator role on our Discord server as well

It should look something like this:
https://gtm.you1.cn/sharedfiles/filedetails/?id=2698021488

We will manually review and accept your donation as soon as possible.
However, please be patient as we cannot always accept donations immediately.

Once the trade offer is accepted your donor status will be active, reconnect if your status doesn't show immediately.

Thanks for your support!