Invalid credentials

We received existing project developed using octoberCMS unfortunately the developer disappeared with octoberCMS login credentials ( where we can login and access license key, write now we can not do anything to continue to manage the website.
What should be done to resolve this issue, since if we want to install any plugin it shows the following response

Invalid credentials for ‘’, aborting.

I need your help please

Best bet would be to purchase your own license key, then set it with
php artisan project:set <license-key>

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