everything looks quite strange, since here on forum your profile is still labeled as a Premium one...
Evidently I got my Premium "Crown" back after I posted the above question(s) and then signed up for the new monthly $5.99 subscription. The GUI then let me go redownload ("replace") all the 3K cards it had downloaded (in 3K) in their 4K format then (I still had many cards in the 4K format which I had downloaded before iStripper evidently "terminated" my Premium membership with no warning whatsoever). It was a goat rope because I had to use the filters for My Collection to figure out which model cards had been downloaded in 3K instead of 4K going back to late 2022, THEN had to go to each individual Model's SHOW page that had been downloaded in 3K to change the selection THERE to 4K in order for it to ASK me if I wanted to replace the 3K card with the 4K card.
Hell, the GUI NEVER "said" my previous Premium membership had expired or wasn't renewable or anything...it evidently just STOPPED it (for whatever reason) and automatically started downloading everything in 3K back in late 2022 EVEN THOUGH in Settings I had 4K Downloads selected (you can STILL do that on the curreent Settings page). You would think that if the SETTINGS were set to download 4K but you COULDN'T do that, it would TELL you it wasn't going to download 4K instead of just downloading 3K. I had around 40 - 50 cards that I thought were downloaded at 4K but just "defaulted" (?) to 3K downloads with no indication whatsoever.
And my Transactions History shows no record of my "upgrade" to Premium Member in the past OR any indication my Premium Member status had "expired". That's absurd. Why? Imagine somebody has already downloaded numerous 3K versions of the cards, THEN upgrades to Premium. Unless they "figure out" themselves how to configure the Filters for their My Collection, the GUI has NO indication they could update those cards from 3K to 4K unless they went to each 3K model card in their entire collection (at least back through 2022...maybe earlier?) to "see" if the card WAS availble in 4K to begin with (many earlier 3K cards AREN'T available in 4K).
And the "User Manual" you can link to says nothing about "Premium Membership" at the time I am typing this.
The new GUI is not very "user friendly" in many areas yet, and will continue to be ***** as hell for totally new iStripper users with no previous GUI knowledge or experience.