If you're looking for a report on the availability of macOS Snow Leopard 10.6.8 ISO downloads, here's a summary:

: Snow Leopard (10.6) is Intel-only and won’t run on modern Macs (post-2011/2012) or Apple Silicon (M1/M2/M3) without emulation.

: If your Mac originally shipped with Snow Leopard, you can often reinstall it using the original gray recovery discs that came in the box. Important Compatibility Notes

Searching for “Mac OS X Snow Leopard 10.6.8 ISO download” brings you to the edge of abandonware. While Apple no longer enforces copyright for this 14-year-old OS aggressively, the safest route is to purchase a used install disc on eBay (search for "Snow Leopard DVD Part Number 2Z691-6589-A") and rip it to ISO yourself.

Are you trying to Snow Leopard on an old Mac, or are you looking to run it in a virtual machine ?