Hello There,
I bought the GA 5 the full version and How can I delete GA SE 5 and GA One Content ? I think I don’t need them having GA 5 the Full version eh?
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Hi @Vocalixx!
You can use the GA SE 5 and GA one Content in GA5 full version, if you have Cubase license. Especially the GA One Content has many, nostalgic, fans 
For the content deinstallation, please use the Steinberg Library Managers “Remove” function.
Thank you Dear 
The Kit SE is bundled in with The Kit in Library Manager, so that won’t uninstall cleanly without deleting The Kit entirely, which will require you to reinstall the Groove Agent 5 Content (30GB+) to restore.
That, or you can dig around in File Explorer/Finder for the specific files and delete them manually.
There are also similar scenarios with HALion Sonic Selection and HALion 7 content.
Cleaner to just nuke the entire Steinberg content directory and install the stuff you want from scratch again (or install only e.g. ABsolute Content and back up that Content directory before adding additional Cubase/Dorico/Sonic Selection/GASE5 content on top of it). That way, you can always drop back by nuking the content directory and copying over the backed up Absolute Content directory in its place - and updating anything that may pop up in Download Assistant.
I did this few months back and it’s running well 