How to get older plugins (i.e. for LMS 7.9) to install on LMS 8?

I am migrating my LMS Server from my trusty old Atom based Joggler to a Raspi4 (boy what a speed improvment!) and while doing that I upgrade also to LMS 8.
However, 2 plugins I can not install teh std. way, as they don't show up in LMS 8 (probably in the repository it says max Version = 7.9)

-> Is there anyway to install these - without downgrade to 7.9 1st and then upgrade again to 8?

I tried to copy the plugins from my old system from this location: /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins
and the respective pref fiels from here: /var/lib/squeezeboxserver/prefs/plugin

But if I do that the system thinks there is a newer version available and constantly asks for update & reboot.
Is there anyway to fix that?

Thanks for your help.


P.S. I you experience some sluggishness in your LMS setup, I can really recommend an upgrade.
(Although LMS on my old system only used a few % CPU while playing music, it must have some really high peak CPU use when searching in Spotty or in Podcast Lists. That REALLY improved with the Pi)