Is it possible to import the old project files in the new project?

Did you try migrating it instead?

Yes I tried to migrate still not working ((
This is very annoying random errors, file is too old, unversioned etc … did you know any hot fix to permanently disable the version checking functionality so I can use and share projects with each other to make my clients happy and make my workflow faster.

Sorry, migration is the only method I know that works.

This is not your fault bro, actually in my case migration is not working because the files is from the old project I build in year 2018,… UE should have a function that allow me to import .uasset files in the editor and validate those old assets during importing…