We are sorry to hear you are experiencing online licensing issues. We are starting a new program (Beta for now) where we review our forums and reach out to customers having issues to help connect them with their VAR.
I have Direct Messaged you about this issue. Thanks for using the SolidWorks and the SolidWorks Forum
Working with SolidworksCare on this.
Multi session on same version works.
Opening 2018 and 2019 doesn't.
Cura plugin used 2019 and it closed 2018.