Error Message

"V-225-302: ERROR: Failed to install SQL Express BKUPEXEC64 instance with error -2067922934"

ERROR: Runtime error: This method explicitly uses CAS policy, which has been obsoleted by the .NET Framework. In order to enable CAS policy for compatibility reasons, please use the NetFx40_LegacySecurityPolicy configuration switch.

The error is suppressed during the installation of SQL, which is done as part of the Backup Exec Upgrade.  In order to see the above error causing the failure of SQL Express 2017 installation, run the setup.exe from the SQL extracted installation folder.

To resolve the upgrade failure in Backup Exec 21.x, follow these steps:

1. From Windows File Explorer, browse to the C:\Windows\Microsoft.NET\Framework\v4.0.30319 folder
2. Open the caspol.exe.config file in notepad and change the line " to "
3. From Windows File Explorer, browse to the C:\Windows\Microsoft.NET\Framework64\v4.0.30319 folder
4. Open the caspol.exe.config file in notepad and change the line " to "
5. Rerun the Backup Exec Upgrade
6. The setting can be reverted to "false" after the upgrade or install of Backup Exec.

The caspol.exe.config files should look like the following.