I am having the same issue. I can open 2019 but not 2020. I spent an hour on the phone with Lacerte and used the Lacerte Tool Hub. This did not fix the problem. Lacerte rep indicated it might be an issue with the new update not working well with Windows. I had several tax returns needed to get out the door today and still cannot get access. Has anyone else found a solution or do we need to wait for Lacerte to fix on their end?