The upgrade from any 2.4.8-x release to stable_2_4_8 will not require any database update. It sounds like you just need the right copy of the files. Git could generate this via commands similar to what I described in the OCS thread:
git clone https://github.com/pkp/ojs
cd ojs
git checkout ojs-stable-2_4_8
git submodule update --init --recursive
You’d need to be careful, as with any upgrade, in changing file permissions on the “cache” and “public” directories.