PL/SQL Developer PlugIn for Trivadis PL/SQL Cop
If yours PL/SQL Developer is x86 you need to compile plugin as x86 or if it is x64 then as x64. You need to place plugin in C:\Program Files\PLSQL Developer 12\PlugIns.
You can use license from PL/SQL Cop for SQL Developer.Extract tvdcc4sqldev.lic from com.trivadis.tvdcc.sqldev.jar and copy it to tvdcc as tvdcc.lic