install a package from the package manager, it works all right, I have the scripts to modify them but when I close and reopen unity the modifications have been deleted.
is there any way to be able to modify a script in a unity package and save it correctly?.
You must not edit code from Unity Packages!, it’s a bad practice, the best way to achieve what you want is to create your own custom class and inherit from the class of the desired package.
If you modify directly the package code, when a update comes all your work will be errased, and if you share your code via GIT or any other version control software, the oter users will not have access to your modifications.