The server may not have a per-card 4K-download-allowed status on individual cards when the user no longer has the global 4K-allowed status from an active premium account.
The Server does have per card the status for the account.
When in the past my yearly subscription end and I could not get it renew I still could download all the cards in 4K that I had before the premium and all the cards that I got during the premium.
Yes In that time I got a new mini PC with a new install of iStripper and could download in 4K.
When I click on the crown it shows the following: (1 year is now 1 month and see differend between Cancel and refund)
Will I keep my 4k files if I cancel my Premium?
Cancelling will prevent the membership to renew but even if you cancel you will keep your advantages for all the period paid (1 year).
Once 1 year has passed and your membership terminated, any Crystal Clear + show purchased during your Premium membership will remain downloadable in 4k resolution even if not downloaded while your premium was active.
Will I keep my 4k files if I get a refund of my Premium?
No, all your advantages will be removed, including the 4k files.