Changelog

Added #379: Mark unpainted and ungrouped vertices in groups. (RC 1)
Added: #392: Support for CouplingTag on mountpoints. (RC 1)
Added: #391: Error for when both an external collision file is referenced and objects exist in the collision collection. (RC 1)
Added: Material variation dropdown menu, allowing the user to quickly switch between versions of a material. (RC 1)
Changed: Switched all documentation links to instead link to the new Space Engineers Official Wiki. SEMREF will be retired, but all its content has been migrated to the SE wiki. (RC 1)
Improved #398: Log decoding error handling. (RC 1)
Improved #394: TransparentMaterial files are no longer exported per MWM file but per BLEND-file. (RC 1)
Improved #389: Mountpoint mode now works better when editing mountpoint areas in EDIT-mode (origins are set to geometry automatically). (RC 1)
Improved: Channel settings on imported images. (RC 1)
Improved: Paint Color handling. This will unfortunately reset all paint color in your exisitng BLEND-files. (RC 1)
Improved: Sum up imported materials instead of reporting them one by one. (RC 1)
Fixed: Paths in exported logs sometimes not getting properly anonymized. (RC 1)
Fixed: SEUT Material being remapped to a linked one. (RC 1)
Fixed: Remap Materials sometimes erroring. (RC 1)
Fixed: Missing character weighting error not triggering (RC 1)

Installation

Refer to the install guide.

Open a new, empty, file in Blender.
Go to Edit --> Preferences... --> Add-ons and remove Modding: Space Engineers Utilities.
Click Install... and select the newly downloaded space_engineers_utilities_***.zip.
Re-enter the paths in the addon's preferences.
Restart Blender.

Closely follow the instructions inside the BAU menu, including restarting Blender after the update is complete.