Djordje, I can answer some of your questions:
1) When you log into your PMI Account, you will see a note in blue about the new PMI-CPMAI Certificate and when you click "Learn More", it will take you to a page with FAQ. For your concern, here is what they wrote:
"If you purchased CPMAI v7, you have 90 days from your purchase date to complete the current CPMAI course and exam. The final day to take the v7 exam is December 30, 2025. After you pass the v7 exam, you will have 12 months to upgrade to PMI-CPMAI at no cost while keeping your CPMAI v7 credential."
2) Will CPMAI v7 learning Products, including CPAMI+ and +E remain available?
"Yes. The CPMAI Exam Prep course will continue to be available in your myPMI dashboard. All CPMAI v7 courses, including the CPMAI+ and CPMAI+E add-ons, will not expire and will remain accessible."
3) The renewal fees will be $60 USD just like all other PMI certificate that you renew every three years.
Hope this helps.