Cubase 12 Pro: problem with content

Hi all. I installed all stuff with Download Assistant Manager (Install All) on new SSD M2 disc, opened C12 and noticed that GA 5 SE can’t open the Kit list — some kits flashes and disappears. Halion Sonic SE also doesn’t content any presets. I use DAM for last years and had no problem with installation.
Now I’m in despair and don’t know what to do. Please help!

First, open the Steinberg Library Manager to make sure that your libraries have actually been installed. If they haven’t, please do so manually by clicking the arrow to the right of “Install”/“Open” > Open Folder and double clicking a .vstpreset file.

Then follow these instructions:

But instead of opening the “HALion Sonic SE_64” folder, open the folder of the Steinberg apps that are currently not showing your installed content.

Thanks for answer! The libraries was surely installed: all was green. And as your second advise — I will try certainly!

It’s solved in funny way: I clicked on Rescan in GA and it found all!