As the The Grid plugin is no longer part of the theme (Question about The Grid extension removed from X theme) I purchased directly from Envato and replaced it manually.
However in the “Automatic Updates” section of the Grid the message remains that it is part of the theme, and I think I would not be able to update it as I cannot enter the envato token…
“This is an exclusive deal for X and Pro users. Your validated theme license unlocks all features of The Grid including the skin builder. Updates to The Grid and support are also included as part of your theme purchase”