Hi Bjorn
I've manged to resolve this same issue, finally, after installing v5.4 Pro. Going into the new Plug-In Manager, it asked me to reset my plugin settings and restart Studio One. After I did, after many months, Loom 2 was finally showing. To note: When ever I start Studio One it is set to scan for plugins, but never picked up Loom until now.
I hope this helps.