Some hosting providers have scripts in place on the web servers to help protect phpbb forum users from having there forums hacked. This script deletes your install folder on any scripts being run within the install folder directory.
The install folder can be very dangerous if left on the root of your phpbb forum directory.
This however can cause issues when installing phpbb modules that use the Install folder structure.
The work around is as follows:-
1 – Copy your MOD or upload using AutoMod. “Once upload don’t run any php install scripts from the install directory.”
2 – Using a FTP client like FileZilla or your hosting control panel software run “Chmod” on the install directory and remove the write permissions for owner and apply.
3 – Now finish your install and once done delete the install folder.