Hi Alexandros Triantafillidis,
to resolve this issue, you can try the following steps:
- Open the Server Manager and go to the "Add Roles and Features" wizard.
- Select the "Features" option and expand the ".NET Framework 4.8 Features" node.
- Check the box next to "ASP.NET 4.8" and click "Next" to install the feature.
- After the installation is complete, restart the server and try to install the update again.
If the issue persists, you can also try running the System File Checker (SFC) and Deployment Image Servicing and Management (DISM) tools to repair any corrupted system files. To do this, open an elevated Command Prompt and run the following commands:
sfc /scannow
dism /online /cleanup-image /restorehealth
After running these commands, restart the server and try to install the update again.
Hope it helps.
Kind regards,
Lei