Do I have to pay again for premium license?

I want to delete app in my phone and use it in my tablet. Do I have to pay again for premium license?

Follow this instruction to set up sync between devices: https://community.alzex.com/knowledge-base/article/sync_mobile

Ok thank you and how can I sync my phone with my laptop?

Version for PC is sold separately.

But where can I find thr registration code? Because I want to install the app in my laptop and it ask me that information

Hello,
All purchases are linked to your Google account, not to a phone.