It happens sometimes.

Close the program, maybe reboot, and try again.

This happened to me more times than I cared for in Tax Season 2022. I decided to buy the Hosted product and have been happy ever since. They do downloads for me.

This usually works for me.  There's also something in the Tool Hub that helps, but I don't remember what it's called.

I encountered this a lot last year and found if I first run updates on the newest (also fastest) workstation in my network I have no problems.  

Three words. Lacerte Tool Hub

After installation of the Hub. Choose Install and WebSetup/force .. that'll get your updates flowing.