Impact supports Minecraft 1.16.5, 1.15.2, 1.14.4, 1.13.2, 1.12.2, 1.12.1, 1.12, and 1.11.2.
There is currently no donator-only prerelease, but there will be one for 1.17 in the future.
Impact does NOT support cracked/non-premium launchers.
If you donate $5 USD or more you will receive a few small rewards such as early access to upcoming releases through nightly builds, premium mods (currently Ignite), a cape visible to other Impact users, and a gold colored name in the Impact Discord Server.
Donations using this new system activate on your Discord and Minecraft accounts instantly, without having to wait at all.