Impact supports Minecraft 1.15.2, 1.14.4, 1.13.2, 1.12.2, 1.12.1, 1.12, and 1.11.2.
Impact for Minecraft 1.16.5 is in donator-only prerelease.
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 (now including 1.16.5 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.