Good evening Nuno and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
After, I purchased the PRO version, now I have two plugins installed, is this normal?
Yes, this is normal.
That is because the Events Calendar Pro extends the Events Calendar, it does not replace it.
Also, i get a notification saying that I need to download the latest version of Event Aggregator, which i didn’t buy and I don’t have on My Account.
That is odd indeed, but no cause for concern.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Secondly, can you check under Events -> Settings -> Licenses
It is possible that you have accidentally entered your the Events Calendar Pro license under the field meant for Event Aggregator.
Hang in there!
Geoff B.