The vote table in the database is used to record clicks after this mod. Votes stop being recorded and it deletes the old votes.
If you chose to start recording clicks instead of votes they should migrate easily into any new database in a new version, but you would have to make the same changes to the software before going live with a new version.
This software change is not part of the Pligg system. kbeeveer46 sounded like they might consider adding it in a future release, but they might implement it differently.
If you reinstall everything from scratch you are starting over anyway and you would have nothing in your database.
Hope that helps. If you have doubts, don't do it.