EDIT:
Regarding your question - the synchronization is automatic, just login to the same account on all devices:
https://group-speed-dial.fastaddons.com/
I hope this helps :)

Hello,
The synchronization is not paid :).
There is only few Pro features, all listed here:
https://github.com/fastaddons/GroupSpeedDial/wiki/PRO-version-features

Most of the features including all Cloud synchronization and backup is forever free!
Best regards,
Juraj Mäsiar

Thank you Marko! I really appreciate it :)

And good luck with your company! That's my ultimate goal as well, to build a company full of skilled programmers, building useful software to make life easier :).

Best regards,
Juraj Mäsiar

Hello,
If you need help recovering your data, please contact me to my support email.
There are cloud backups so if you had your data in the cloud, they could still be in the one of the offline backups. Also, there are local backups that you could check as well - from the main menu / "History /backups".
Best regards,
Juraj Mäsiar

Hello,
It's fixed now in the new 16.1 version released yesterday.
Best regards,
Juraj Mäsiar