Problems installing Audio Unit components on High Sierra
Actually, I have made progress with my setup. The trick seems to be to be disciplined enough to carry out the installations, then deleting /Users/[USER]/Library/Caches/AudioUnitCache/com.apple.audiounits.cache, then rebooting, before finally opening Logic Pro X again, at which point it should rescan all the new plugins. It's a fiddly procedure but it seems to work!