SOLVED - here's how - Spark "System needs to be updated' Download Failed....?

[yesgrey]

*Brancher tout vos produits Devialet par cable ethernet à votre routeur / Disconnect all your Devialet products with Ethernet-cable from your router
* Essayer de nouveau la mise à jour. / Try again

I think you meant: Connect all your Devialet products with Ethernet-cable from your router.

Another thing you could try is to uninstall Spark and then install it again.