If you have a real serial number but are running into errors, don't panic. Here are the most common solutions straight from the Acronis Support Knowledge Base "This number corresponds to another product" Error:
Search your inbox for "Acronis", "Cleverbridge", or "DigitalRiver". The original purchase email contains the 64-digit serial number. Inside the Software: If you still have it installed on an old machine, go to Help > About to find your serial number. Boxed Version: acronis 2018 serial number link
This article explains:
on third-party forums or pirate sites poses significant security risks: If you have a real serial number but
The most reliable way to find your serial number is through the official Acronis Account Portal. Inside the Software: If you still have it
This was a known glitch in early builds of the 2018 software. To fix it, click the "A new version is available" link inside the app to download the latest update build, which resolves the false error. "You’ve exceeded the maximum number of activations":