Version 9
PROBLEM
Unable to complete the install the latest version because of error: "Hornetsecurity VM Backup requires Microsoft .NET Framework v4.8 to run. Please install the .NET Framework and run this installer again.".
CAUSE
VM Backup version 9 and upwards requires .NET version 4.8 or higher.
SOLUTION
Download and install .NET 4.8 or later from here: https://dotnet.microsoft.com/download/dotnet-framework
Note: If installing on Windows Server 2008R2, installation of SP1 is required before installing .NET 4.8. If installing on a Core setup, you can run the .NET installer with a switch of /q and /norestart, so you will be able to reboot in your own time later.
Once this is fully installed, you'll be able to proceed with the VM Backup installation.
Version 8
PROBLEM
Unable to complete the install the latest version because of error: "This application requires Microsoft .NET Framework v4.7.2 or later to run. Please install the .NET Framework then run this installer again".
CAUSE
VM Backup version 8.24 upwards requires .NET version 4.7.2 or higher.
SOLUTION
Download and install .NET 4.7.2 or later from here: https://dotnet.microsoft.com/download/dotnet-framework
Note: If installing on Windows Server 2008R2, installation of SP1 is required before installing .NET 4.7.2
Once this is fully installed, you'll be able to proceed with the VM Backup installation.