Hello,
I have experience creating installers using InnoSetup and NSIS.
Both of them are powerful installer generators with script-driven workflows, and are free for commercial usage. As a hacker I sometimes have to repack some very large softwares, and the most crazy thing I did was to repack the Visual Studio Community. That involved generating tens of thousands of installer scripts using my own code and the result was wonderful: With the repacked VS installer, I can make the (desktop development part of) Visual Studio work perfectly on any computer in 3 minutes! You know normally it take hours to install the VS through DVD image and sometimes it fails eventually and breaks your system, so my VS installer is a big advantage.
With such a strong background in playing with installer generators, I am very confident to finish your task and I can teach you the secret of how to repack any software if you want to. Please hire me!