In rare cases, closing the software causes the "Qt5CoreMx64Qt5.15.1.dll" file to crash, which in turn prevents the program update from being installed.
The problem can be solved by this simple adjustment:

• Click on the three-dot menu in the upper right corner of the media pool 
  
• Turn off the "List View" setting.

After restarting the software the problem is solved and the update can be installed without any problems.
After updating the software, activating the "List View" setting will no longer cause the file to crash, allowing you to re-activate it whenever you want.