This plugin should allow the removal of Freeside Open for users who have had problems with it, and are unable to revert to an earlier save.
Moburma already made a Freeside Open Remover, but it didn't do a very good job at cleaning up, so this updated and improved Remover should
hopefully put any NPCs back exactly where they belong, and fix up all the missing scenery and walls.

No guarantees this will work, but it's got to better than nothing, right?

How to use:
1) Make sure you have a save that is somewhere outside of Freeside. Near Freeside's North Gate is recommended.
2) Disable FreesideOpen.esm and FreesideOpenPatch.esp
3) Enable my plugin.
4) Follow the in-game instructions. It'll only take a minute and involves a short walk through Freeside to The Kings.
5) Once finished you can remove my plugin.
Good Luck!

Notes:
Modded NPCS may end up being somewhere close to where they were rather than at their original spot.
NPC corpses may not be moved back.
Any dropped items or missing NPCs (if any) will still be in the out of bounds area of FreesideWorld. You could use console commands to get them back.
You may end up keeping some of the additional restored NPCs, but that's not really a problem is it?

If I missed anything, or it doesn't work for you, please leave a comment.