Bought on itch.io, didn't receive a BLENDER_MCP_PRO_LICENSE key
BLENDER_MCP_PRO_LICENSE
The itch.io version is a one-time purchase (no license key required) — there's no need to enter a BLENDER_MCP_PRO_LICENSE key. Once downloaded, it should work right out of the box.
Okay, the readme.md threw me off
