Update an old project installed on the server

I have an scriptcase application installed on the server, but now I need to update many of the functions, but only I have what is on the server, I did not developed this app.

it is possible to move all files to a local computer to update the application and update to v8 and to do many changes on that or I need to work on the server

Unfortunately no. What’s installed is the result of a generation process, not the project itself. So if you haven’t got the original project, the only way you can modify is by modifying the code on the server. (or recreate a similar project and rebuild from there)

when you said “modifying the code on the server” mean to use a editor and open the php scripts and do the changes ??

If you need to do minor changes you can do that indeed.
Changing the application in scriptcase itself and regenerating and redeploying i tis the best solution tho. So aducom meant this.