Plugins now incompatible with Cubase 11

I am unable to use either Halion Sonic 7 or Groove Agent 5 anymore because I don’t have the license. I don’t know when this happened as I had a license for earlier versions which I no longer have access to. This has ruined every song I have worked on and despite all of my troubleshooting I cannot get anything to work anymore.

What version of Cubase? If you have Cubase pro then you have a usb licencer for version 11. Have you updated elicencer?

Cubase 11 wasn’t bundled with HALion Sonic 7 in the first place. As @mkok already wrote, there was a licensing change for some Steinberg products. So you need to update the licences to Steinberg licensing to be able to use the new instruments.