I search on the interweb
here advises you to limit your installed ram to 4GB - remove anything over this. Not sure of the background as to why this might be an issue or cause, but give it a go.
Here's some more troubleshooting advice, suggesting you sign-out of iCloud etc, and install macOS from a removable source (USB stick etc).
And
this page discuss similar issues with a MBP, where the SATA cable has failed, causing the issue. I suggest you move the drive you want to install to, to another direct connect bay. Also, check out in System Information (SATA) or in Disk Utility (under the drive, not the partition) that SMART says "verified" or "Passed" to make sure the drive's integrity isn't the issue.
Speaking of the macOS installer, I suggest you install a brand new full version again. I can't vouch for the integrity of
this one - you may be able to find from a verified source.
And I have a strange feeling (memory recall?) that you may have to install Snow Leopard from a DVD. I think there was a way around this that patched the installer so you could install from a USB stick or external drive.
And you might like to consider
this work-around of changing the system date in order to install. This does relate to macOS 10.10, however the same might apply to installing Snow Leopard.
Let us know how you go. And don't forget to add your system specs to your Signature as has already been suggested.