DDPM update to v2.1.1.0007 - Ok button not clickable

DDPM wants to update to Version 2.1.1.0007.

I click on Install, file is downloaded.

A Message Box appears saying "The current software will close before installing the software. Do you want to update now?"

Click on "No" cancels the update.

Click on "Yes": nothing happens. NOTHING. Even clicking 10+ times does not change anything. Clicking "No" closes the update dialog box immediately. At least it's not hanging, but....

That's not funny. Is there a solution?

Regards

Matthias

P.S.:

MacBook Pro m3 running macOS Tahoe 26.0.1 (latest and greatest version)

Dell Monitor U2723QE from Sept. 2022