Sorry to hear this, Yan!
These forums here our are “Pre-Sales Questions” forums, so we will not be able to provide technical support here.
With this in mind, I would recommend the following things:
1. Log into your account on this site which has the premium license.
2. Post your question in a Premium Support forum so that we can best assist you.
3. In that thread, can you post your system information? Here’s how to do that → https://theeventscalendar.com/knowledgebase/sharing-sys-info/ That will give us a head start on investigating some things that could be a factor here.
4. In that thread, can you post some event IDs from Facebook you’re trying to import? Or Facebook page IDs, whatever you prefer — this will just help us test your exact imports.
Thank you!
George