Hello @mdelgado,
It does rely on snap 8.0.0, so when you install snapista you get snap 8.0.0 installed.
For updating it, you need to follow the same approach as for snap headless updates.
Here’s an example for installing idepix for Sentinel-3
${PREFIX}/snap/bin/snap --nosplash --nogui --modules --install org.esa.snap.idepix.core
${PREFIX}/snap/bin/snap --nosplash --nogui --modules --install org.esa.snap.idepix.olci
For older or newer versions, one would have to do the equivalent of https://github.com/snap-contrib/snap-conda for these versions.
I hope you have all the info requested