Someone was developing website for one of my friend and that person is busy so he zipped whole website using duplicator and forgot to provide installer.php
We found a developer after 1-2 months and when we passed that package to him, he asked for installer.php and we couldn't find it.
Now developer who started this website is saying that he doesn't have this website any more and he can't help us.
My question is, Can I use any installer.php file to upload this package or it has to be package specific.
Thanks for help in advance.