'License Key is Invalid' error when registering ReSharper (ReSharper 4.x - 8.x)
Currently, ReSharper license keys are mapped to the username, which was specified in the License Certificate e-mail. Please use the exact Username/License Key combination, as it is specified in the email (copy and paste is recommended).
Here is a common example, when wrong username (e.g., developer name) is used instead of correct one (e.g., Company Department name):
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Somehow related to the issue I encountered. Here https://resharper-support.jetbrains.com/hc/en-us/articles/207242755/comments/360000044750