Check out this thread. This has the steps to enable AI Center.
If you are using Community version of UiPath Studio and if you enable AI Center the trial version is only for 60 days. After the pro trial ends it’s goes to free plan where only Studio X will be available and not Studio.
If you want Studio you need to create a new organisation with the same email account to access Studio. After that you can again enable Pro trail for AI Center. But again note that it’s only for 60 days.
Hope you understand!!
Regards