Oh what fun for a year end! I too have had inordinate trouble getting the Artlantis export option to show: Having followed all the advice I could find on this forum, including changing the .bundle extension to .apx (thank you Pierre Judde), substituting Ignacio's add-ons (thank you Ignacio), and inserting a 'PkgInfo' file into the extension contents file (thank you Ralph Wessel) - all with their computer restarts ........... I still had no success.
The solution that has worked for me is to:
1. Save user profiles / templates / preferences / etc.
2. Remove 'offending'
ArtlantisR-Studio_Out.bundle
from Import-Export folder in 'Add-Ons' folder
3. Reinstall AC11 from the original CD (archive & install),
4. Install AC11-1114 update
5. Bingo! .........it works (for me, for now...)
6. Re-instate profiles / templates / preferences / etc
Good luck & Happy New Year
AC27 Apple Silicon. Twinmotion.
16" M1 Max MacBook Pro 32GB, Apple Studio Display, MacOS 15