Unsure at the moment but try contacting staff accounts on discord or asking around the community haven't used testbed in awhile.
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Join the Graalians discord server, you can talk to some people from testbed there. If you just want to level offline, Gonstruct works best for my uses. You can download tilesets from caching them on your device or transferring them to your PC.
Also nice necro buddy
Thanks Guys That Helped alot :)