your addons most likely will still be stored under C>ProgramFiles>Blockland>Add-ons or C>Blockland>Addons because a new blockland folder has been created in MyDocuments so you can copy and paste them from your old addon folder to the new one if for some reason it isn't there anymore your out of luck a system restore point may be required, I'm not actually sure if using a restore point will do anything so don't get mad at me if it doesn't work