I doesn't work like that... Prosilver templates are different between styles because style authors add new images and change current image paths in some cases, change alignments and positioning of many different elements and so on.
Just download the style again and upload the viewtopic_body template then redo the edits.
Even so if you have a test forum you do edits on if something messes up you definitely have a back up of the files on the main forum so it is easy to restore -😉-
Could be alot of things... Check the edits in the acp files that you edited.
Reputation is really not the best mod to install when you are new to mod installation... especially if you had trouble with quick reply as the reputation mod is a lot bigger with more to go wrong with SQL, modules, many more edits and inline edits which i don't think were in the quick reply mod.
I know. I did the SQL queries successfully though. I fixed all errors but the ACP index is still not working. What file is the most likely one? I reset functions_admin.php