Older versions of WinBootMate (pre-2020) only require the key, but newer builds ask for both email and key . If yours asks for both but the email only has a key, use the email address where the license was sent.
Many users mistakenly enter a secondary email (work, spouse’s, or old address) during checkout. Log into any other email accounts you own and search for “WinBootMate.” winbootmate license email and key
Are you currently of a specific version of Windows, or Older versions of WinBootMate (pre-2020) only require the