The jump from version 2.3.x to 2.4.0 is substantial. Alt Tab has listened to community feedback. Here are the exact patch notes (compiled from developer releases):
Assuming you have obtained the legitimate AltTab_EasyFog2_v240.zip file (either by purchase or a free promotional license), follow these steps:
Step 1: Do Not Unzip the File
Blender installs add-ons as .zip archives. Do not extract the folder.
Step 2: Open Blender Preferences
Step 3: Install from Disk
Step 4: Enable the Add-on
Step 5: Save your preferences
| Issue | Fix | |--------|------| | Fog not showing in Eevee | Render Properties → Volumetrics → Set "Tile Size" to 2px or 4px | | Add-on not appearing after install | Restart Blender, check for console errors | | Crash on heavy scenes | Switch from "Cube" to "Plane" fog type |