Can I enable paid license for one account

[Abdulghani Alkahteeb]

Can I enable a paid license for one trello account instead of all teams?

why some plugin stopped working

[Daydreamer Mike]

You need to understand the concept of workspace members, multi-board guests and single board guests.

1) Workspace members - Can have access to all workspace visible boards in workspace.  Billable

2) Multi-board guests - Added as a member to more than 1 board in the workspace but not a workspace member so can't see all of the workspace visible boards, just the ones they are a member of - Billable

3) Single-board guests - Only a member of 1 board - Free

Paid power-ups often bill on a per-member basis so you have to bear this in mind also.