M1
Sonoma 14.3
Logic Pro 10.8.1

works fine, thanks MORiA

for them where the „double open trick“ not work

my solution for Sonoma 14.3 and AU :
Is to build the missing "*.ops" file

(If you have other UJAM Plugin working. Or in last VG-Sparkle and VG-Amber the ops file gets installed with the patch)

-show hidden files
Press CMD + Shift + „.“

-Go to User/„your Name“/Library/Application Support/UJAM/

-Copy a working UJAM Plugin Folder“ to Desktop

-Rename Folder to "FIN-RETRO“

-Rename inside Folder the „*.ops“ to „FIN-RETRO.ops“

-Delete the Presets inside Folder

-Put the renamed Folder with the „FIN-RETRO.ops“
to User/„your Name“/Library/Application Support/UJAM/

Without rosetta
Reload PlugIn and have fun

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Another:

Worked just fine for me on the second open on intel and Catalina. Will probably uninstall though, doesn't sound nearly as good as I was hoping for. In fact it doesn't really sound very good just in general, but that doesn't have anything to do with the ability to try, which is appreciated, it works, and I'm sure some folks will be into it a lot more than me.