@Jessb2002
Even though you associated them with another program does not mean that they will stop working in Sims 4. You say you "changed them back to package". Does that mean that you added a new .package extension to them. If so that will mean that they will no longer work in Sims 4. On Windows Explorers toolbar select View and then File name Extension. You can now see what the files are actually called. If you see .package.package then delete the last one.
Because of the other damage you did (you can not manually move the game files) rightclick the game in Origin and select Repair.