How do i install developer licenses on a 10 user server?

[Development Admin]

We recently downgraded our 50 user Jira license to a 10 user license.  As part of this, we apparently lose the "development" license.  While annoying, i purchased another 10 user license for jira core, only to find out that when updating all my plugin licenses to their development licenses, that they are incompatible.  Am i expected to purchase each plugin again?

[Nic Brough -Adaptavist-]

No.  JIRA doesn't do field level security.  It only goes down to "I can see this issue.  Or not".