Fix Safe Issues merges conservatively identical images/materials and tidies unused items. Color-space correction is a separate confirmed action in 0.1.1. It changes rendering, including any World, compositor or Geometry Nodes uses sharing that image. Review these before confirming. Texture reduction can lose detail.

Yes. Every fix is a single undo step, so Ctrl+Z restores it. Reduced textures are packed copies; undo before saving to get the originals back.

No. Materials and images linked from other .blend files are skipped by every check and fix.

No. They're estimates of decoded texture size, not measured RAM or VRAM.

It's tested on Blender 5.1 on Windows. Other versions aren't verified yet.

Mini is a separately purchased standalone add-on: Pro is neither required nor included. Mini focuses on a small scan-and-fix popup; Pro provides the material browser, usage analytics, previews and deeper tools. Both are by bashpacks (Rimas Albert).