Need some help with cracking an .msi install file

I suggest to try the Windows Installer Editor from Wise Package Studio.
So far I found that it is the best tool for editing .msi installer files (delete,
replace components, edit scripts, etc).
Custom dlls for authorization can be found in "Project definitions\resources"-
simply reverse existing one, write your own with necessary features, replace
original dll (somtimes it's possible to simply delete original security dll).