ReSharper license issue: "This license isn't for ReSharper Ultimate. It's for another product"

Problem

An error message is displayed when attempting to activate ReSharper using a license key: "This license isn't for ReSharper Ultimate. It's for another product (ReSharper and 7 more)."

Cause

The activation code being used is outdated and is applicable for a previous version of ReSharper.

Resolution

1. Download an updated activation code from the JetBrains account. Follow the instructions provided for offline activation.
2. Alternatively, activate the license using the JetBrains Account.

If further assistance is needed, reach out to the ReSharper support team.