Please follow these steps to active/update your account numbers for your EAs:
1) Add the URL 'https://www.forexeasolutions.com/' in the MT5 -> tools -> expert advisors -> allowed URLs
2) Fill in your License Key above in the search
3) Click SEARCH
4) It will now show all accounts activated (or empty slots) and for which EAs (the ones that were already activated in the EA file from before (hardcoded) won't be displayed here)

5) Fill in/Modify each account number in the slots that you want to use, and click on "Update" for each one.

6) Then, in the EA, fill in your License Key also in the parameter (top of the parameters)