how can I confirm a meeting invitation wth the old calendar UI?

how can I confirm a meeting invitation wth the old calendar UI?

I frequently receive meeting invitations from people outside my organization via ZMail. When I open the invitation in mail.zoho.eu and click on "add to my calendar" that button changes to "show calendar". When I click this link, I am taken to the event details in the old calendar UI.

Confirming a meeting works fine with the new calendar UI, but the new mail UI takes me to the old calendar UI :-(
How can I confirm my participation in the old calendar UI?

thank you
Oliver

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