Some have suggested they’re going to sit on upgrades they bought in the current sale for more than one future paid upgrade cycle. I think this might turn out to be pointless - I have a feeling that the most you will get if you delay activation of a Cubase 10 licence is one grace period upgrade which will be to Cubase 10.5 if Steinberg continue with the system of paid .5 upgrades. I simply don’t know either way what will happen, not least because Steinberg might change their policy.
Unless Steinberg change the system again, you will download Cubase 10.5 (or whatever the next version is) using Steinberg Download Assistant - you don’t need to obtain a download link. As Steinberg Download Assistant is a relatively recent innovation, I think it likely Steinberg will stick with it.