ERROR MESSAGE "The Installer could not install the software because there was no software found to install"

I'm trying to install ToonTrack Superior Drummer 2.0. There's a series of 5 discs for installation. I've looked for some solutions online and only tried disabling the SIP in Recovery Mode, which I did, restarted, and it still didn't work. I'm on El Capitan 10.11.1 on a MacBook Pro and I don't know what to do. The Capitan has been causing me issues with drivers that I eventually got figured out so it's probably some bug with it being new and all. Please help.