This subject has been extensively discussed in forums.
The solution is in Object Desktop Manager to disable notifications as shown here:
https://forums.stardock.com/514136/page/2/#3898804
You can check the version number of your OD apps in the apps themselves and compare to the version available in your Account (click on your avatar in the top ribbon) and choose Downloads>Object Desktop Manager tab > View Individual Downloads to see if you're up to date.