I've got an answer from Jasper support:

Cloud Software Group has directed Jaspersoft to cease all business with Russian-occupied territories in Ukraine. Due to the fact that CSG does not have the resources to differentiate regions in Ukraine, a business decision was made to cease providing software to all of Ukraine until further notice.

So, there is only way fro Ukrainians to set up JasperStudio 6.21.5+(alternative method will show up) and get password using alternative method throw VPN.

It is unfair enough but we must accept such situation