How to make software repack?

[PsYcHo_RaGE]

I guess its same as repacking games.
install the game or software and repack it....isn't it?

no no its not that simple, sometimes it sucks

but here are some tips:
1. MSI installers you would use InstEd (this is the only tool you need really,) or Orca (from Microsoft SDK,) InstallShield and/or Advanced installer to edit then rebuild the installer (you can also edit these with vbs files.)
2. Inno Setup installers you would use a program like innounp to extract, you would then need to edit the iss file to remove/add any missing and or useless code from the file, this takes some experience.
3. Nullsoft Installer System (NSIS) these cannot be repacked, best to take these and repack them as Inno by recording the reg entries and adding these with the files to your Inno setup.