If you don’t want to delete the Software that is creating obstacles for you, then follow the given instructions:
Begin the process by pressing the Ctrl+Alt+Delete tab.
This will launch the Task Manager; there, you have to select Startup.
Next, look for the Program that is hindering while installing Sage 50.
Right-click on that Software, to get the options.
Select Disable, head to the details section, and look for the Program again.
Once you find it, select the End process option, and you are done.