You will also need to download the 2.4.46.0 item packages.

v4.46.1: Fixes leaks, and mandatory items always being unlocked.

Enhancements

• #573: Show filename in tooltip for custom screenshots.
• The app is now able to handle having music, voicelines etc selected that
  aren't defined in loaded packages. Exporting will fail, but no crash will
  occur and the selection will be preserved unless changed by the user.
• If an error occurs, the compiler will now prepare a zip containing all the
  relevant files for debugging the error.
• Flip Panels will now have correct lighting in all positions.
• Dynamic Angled Panels set to start deployed will be lit for that position.
• Palettes and configs will now prompt if future versions of the files are found.
  These will also be backed up if chosen to be loaded.
• Connection Signage now has a legend like regular signage.

Bugfixes:

• The case where no voicelines are set is once again handled correctly.
• #4431: Fix monitors not showing the voiceline character.
• #4431: Fix elevator videos not appearing.
• Fix initial state for "variant" dropdown boxes on item properties pane.
• Automatically patch tools/toolsinvisible to allow light to pass through.
• Fix app not quitting when initial loading screen is closed.
• Fix default values not being used for items like Cube Colourisers and Corridors.

UCP-Relevant changes:

• Add SweepTrace mode to Collisions result. This allows creating collisions
  which extend until impacting a surface.
• $fixup variables may now be used directly in condition tests/results, behaving
  like the instvar/setinstvar tests/results respectively.
• TrackPlatform result changes:
  • Add multi_track, which allows replacing the instances with multi-voxel
    long ones for better efficiency.
  • Add track_len_var, set to the length of each track instance.
  • The "bottom grate" instance will now inherit platform fixup variables.
• Fixed TemplateBrush 's invertVar option not working properly if colorVar = <editor>.
• Templates may have "auto realign" enabled, which automatically realigns all 0.25-scale tile faces.
• Added Migration section to items, allowing specifying an old ID to convert to a new one.
• Allow fixup values in many more TemplateBrush options - force, colorVar, forceVisVar, senseOffset, outputs and pickerVars.
• Allow fixup values in MapInstVar values.