Is this computer running Norton by chance?  There has been a lot of talk in the forums lately about Norton interfering with the new update of Sage.  In both cases, a call to technical support was necessary.  Here is the link to the discussion on the Norton problem: https://www.sagecity.com/ca/sage_50_accounting_ca/f/sage-50-ca-general-discussion/152474/2020-2-update

If you aren't running Norton, try going to your Task Manager and making sure that Sage isn't already running in the background somehow.  

Good luck.

Cheers,

Andrew

Thank you so much...it looked like it was running in background. 

it's all good now. Thanks