Actually, it seems that the curl does not return the correct dmg version (1.9.6 instead of 3.3.3) and I can't figure out why.
I need some help, please

https://protonvpn.com/download/macos-update3.xml seems to hold the version

So curl -s "https://protonvpn.com/download/macos-update3.xml" | grep -o 'https*://[^"]*\.dmg' | head -1 should work

Interestingly it pulls a later version that the website

The more I go down this rabbit hole, the more confusing it becomes.
I thought I would check out which version was on winget and it's the same as on their github: 3.2.7

But the download link on their site is for: 2.4.3

Basically I was hoping the ios/mac repo could have been used as a source of truth but its on version 3.1.4.

So really nothing makes sense

Haha, yes it's pretty all over the place for macOS. Odd as the other ones are upto date in GitHub.
I guess they've settled on the rss feed

or maybe this

protonvpn)
    name="ProtonVPN"
    type="dmg"
    downloadURL=$(curl -s "https://protonvpn.com/download/macos-update3.xml" | xmllint --xpath 'string(//enclosure/@url)' -)
    appNewVersion=$(echo $downloadURL | sed -e 's/^.*\/Proton.*_v\([0-9.]*\)\.dmg/\1/g')
    expectedTeamID="J6S6Q257EK"
    ;;

@loicyannou Do you want to make another commit?

Sorry @guy-tallon, I missed your message
Thanks for your help
I updated the commit with your insights

Great! Thank you for updating it

Thank you!