If you never registered an online account, your next step is to contact the source of purchase.
If you are locked out because you also forgot your login credentials, the app itself can help you identify your account details using the hardware serial number: on your tablet and tap "Login" . Select "Retrieve Password" .
Here’s a helpful post regarding a lost activation code:
The immediate consequence of losing a Launch X431 activation code is the restriction of access to the device's advanced features. This can halt work on vehicle repairs and diagnostics, leading to delays and potential loss of income for professionals. Furthermore, the inability to update the device's software means missing out on new features, vehicle coverage, and fixes for existing bugs. Over time, this can render the device less effective compared to newer models or tools, potentially necessitating premature replacement.
Once recovered, save the code in a secure note (cloud or password manager) and take a photo of the device’s serial number sticker.