Cubase 4 - any upgrades still available?

Hi there
First time user of this forum. I have come in search of any possible way to upgrade from my Cubase 4 to anything newer. Can’t seem to do it through the actual application, or find any links online. Understand if its not possible but it would be great.
(I am returning to making some music after many years of having all my gear away)

Thanks heaps

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