I have installed 3 fsp version 5.3.0, 5.4.0 and 5.5.0. i download zip file and pasted it content in e2studio support area folder it was working fine until i changed my workplace folder. in new workplace folder no fsp is installed error.
I suppose root cause is using workspace created in different version of e² studio (or created as different user). Support area is configured in each workspace and the folder paths are differ depending on e² studio versions.Don't share workspace among multiple versions of e² studio.