Apple provides a hidden support page: This page gives instructions for customers who previously purchased Snow Leopard through the Mac App Store (available from 10.6.6 onward). If you have an Apple ID that was used to download Snow Leopard before, you can find it in your Purchased tab of the App Store (if using a compatible older Mac running High Sierra or earlier).
Before downloading, ensure your Mac is compatible: os snow leopard download
Apple provides a hidden support page: This page gives instructions for customers who previously purchased Snow Leopard through the Mac App Store (available from 10.6.6 onward). If you have an Apple ID that was used to download Snow Leopard before, you can find it in your Purchased tab of the App Store (if using a compatible older Mac running High Sierra or earlier).
Before downloading, ensure your Mac is compatible: