Use Case:
Downgrading from Cyber Protect 15 to either Acronis SCS Cyber Backup 12.5 Hardened Edition or Acronis Cyber Backup 12.5
Symptoms:
Installation fails of older product after removing Cyber Backup/Protect 15, specifically error 1603 in the MSI installation log showing error:
"Error 0x450001: Failed to set named security info of the folder 'C:\ProgramData\alsdb'."
Solution:
Rename this folder to alsdb.old and run the installer again.