Websites like or SoftwareSupply sell legitimate OEM keys pulled from system builder packs. These are not free, but they are cheap ($25–$35). The risk is low if the seller is reputable, but note that these keys are not officially supported by Acronis.
Verify that the target or source drive is from the correct brand. If using an external enclosure, ensure the enclosure chip handles data pass-through correctly so Acronis can read the drive's vendor ID. Error: "Serial Number Is Blocked" Acronis True Image Oem Serial Number
This error usually means the software cannot detect the specific brand of hard drive required to run the program. Websites like or SoftwareSupply sell legitimate OEM keys