Error of simultaneous work in 1C ZUP?

Question

1C

Tell. When working in 1C ZUP 8.3, sometimes the program swears that more than 1 user cannot work at the same time. We thought because the program was bought for 1 user. We uploaded another ZUP that was bought for 3 users but also swears. As I understand it, he swears because. ZUP Basic and need to buy Prof?
If it's still a matter of the ZUP version (Basic or Prof), after installing Prof, is it possible to transfer data from Basic? And if it is possible, then how?

Answer 1

Basic can be upgraded to prof. Here about the upgrade is described .
As I understand it, you still have to have a subscription to ITS.