It would be very helpful when there is an update of Osclass, themes and plugins to know which files are affected and to install only those and not all the files resulting in modifying all the settings and changes we have made to our website resulting in the need reconfiguration of the site from scratch.

You can took backup and compare with new osclass them plugins files. so you can identify updated code files with new code difference. and manually update your osclass version and theme + plugins.

This task only done manually with carefully handle all coding structure. need coding knowledge and experience.

I am doing this from long time, its help me to keep old setup continue and no any SEO or custom function losses.

I can help - Paid Support available.

Thanks for the answer. What you suggest I can do myself, it's just time consuming and tiring.