Question

I bought the studio one artist 3 to 4 update and I don't see any link or notice to proceed with the installation. only the purchase and charge data appear

Answer 1

After you bought it, it should appear under "My Products" in the Presonus account. There you can download it. The product key is also visible there.

Answer 2

No link has appeared in any place. That's what I'm concerned about.
 Otherwise I'll ask for a refund