I have manager but i want to know how i can buy it

1

i have manager but i want to know how i can buy it

2

Desktop version is free.

Only cloud edition and server edition are paid. you can find the instruction in their respective pages.

3

As already said Desktop version is free

Cloud version is $29/month
https://www.manager.io/cloud/pricing/
Server Version is $299 for life.
https://www.manager.io/server/pricing/