@PF Dental Welcome to Microsoft Q&A community forum.
Sorry for the painful experience. Please check the basic requirements as show in the snippet below
Reference guide - https://learn.microsoft.com/en-us/azure/backup/backup-azure-mars-troubleshoot
If requisites are met and still issue persist, suggest you to try the following:
- Copy "MARSAgentInstaller.exe" to a folder
- Opened CMD (As Admin) and navigate to that path
- Run the command - MARSAgentInstaller.exe /s /x /b
- A popup message will ask you for the path to extract the file
- Files will be extracted
- Install the packages by order (starting from down to up)
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