Dorico 4 always complaining about plug-ins – Dorico

I have five plug-ins from SSL that I had a 6 month license for (now expired). Every time I launch Dorico, I get 5 error messages that these five plug-ins are not activated. I have deleted these plugins from iLok and I have deleted them from my hard drive.

I also got these messages from Logic Pro and from Universal Audio Luna on start-up, but removing them from my hard drive and from iLok has solved it.

Can someone point me in the right direction? Thanks.

Note: I had the same issue on Dorico 3.5. This is not a new issue on 4.0, but it persists.