Specifically, regarding the upgrade paths, it's a little confusing due to your rebranding of product names multiple times over the years, but all of my licenses show up so that's not an issue. I didn't buy any other products once I knew about Shreddage 3 a few months back, but I was expecting that what I currently have was still part of the Shreddage 2 line-up that leads directly into Shreddage 3, but I could be wrong.
Shreddage Bass Picked Edition
Shreddage II
Shreddage 2X
That's not what they were called when I bought them, and I think the updates were free, so it may be that I am considered one generation behind from a pricing point of view. I just thought I'd bring this up because it may also be why some others didn't see their expected upgrade coupons.
I initially saw the $20 upgrade for Archtop (a product I was not expecting to be Shreddage-ized), and took advantage of that, after which the loyalty discounts appeared for owning a Shreddage 3 product already. But nothing related to the Shreddage 2 licenses, which likely would be heft discounts.
It's not a big deal either way, as I only use this sort of thing during early mock-up stages, with the exception of the Archtop which I use in final production on material where my skill level isn't "there".
But it's good to know if there's a technical glitch, so that one can prioritize one's budgeting. I do like all of these products quite a bit, so will definitely upgrade to Shreddage 3 if there is supposed to be a similar discount for the three "earlier" products mentioned above.
Impact Soundworks remains one of my top vendors, in terms of what actually gets used in production work. The attention to detail, knowledge of the genres and instruments, and mic choices, are always superb. In the case of Shreddage 3, it's pretty obvious that the upgrade and the more consistent branding of the full product range, is a reaction to competition from OTS Evolution (also excellent), but I actually see these vendors as complementary and both being top in their game. Ten years ago or so, we had nothing even remotely this usable and realistic for guitar and bass mock-ups!