Yes. The addon is pure Python and works on Windows, macOS, and Linux. The Help button opens PDF files using the platform's default viewer on all three operating systems.

The minimum required version is Blender 4.2. The addon has been developed and tested on Blender 4.2 and later. Blender 5.x should work — if you encounter any issues, use the Report Bug button in addon preferences to send a report.

Run Check All Markers first to find any coincident markers and fix them. Easy Rigify also includes a built-in safety pass that corrects most zero-length bones automatically, but if two markers are placed at exactly the same position the safety pass may not be enough — those need to be moved apart manually.

Two markers are in the same position (within 5mm of each other). This usually happens after auto-detection places overlapping landmarks. Move one of them apart manually before aligning. Coincident markers create zero-length bones which will cause Rigify to crash during generation.

Fan bones are extra deform bones placed at joint hinges (shoulder, elbow, wrist, hip, knee) that help preserve mesh volume when a limb bends. Without them, elbows and knees can collapse or pinch. They are optional — generate them from the Tools tab after your rig is set up if you want cleaner deformation.

Yes. Align Rig positions the metarig bones but doesn't lock anything. You can enter Edit Mode on the metarig and adjust bones normally before running Generate. Just re-run Align if you want to reset back to marker positions.

No, a single body mesh works fine. Smart Bind and the weight tools support multiple meshes at once — body, clothing, eyes, teeth, and tongue each get appropriate bone filtering automatically when detected.

The rig system is built around Rigify's Human rig, so it works best with bipeds. Quadrupeds and non-humanoid creatures are not currently supported.