grab the .1 to .2 BR pack just the update.
cards are independent. The Card can be for HS1 (incompatible, don't start.) Or AI (compatability starting to break/deprecate versioning and way they are packed...)
Same thing for .zipmods. HS1 or PH won't work on AI/HS2... It is what it is.
Generally? I don't know how to identify just at a glance. aka not even doing a right click "properties" -> "details" on a file. Does nothing. Same thing for cards.
You could check if the card has a valid format with.
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before you panic... top right.. change language.
Pro-tip try not to have more then 50 cards at your top level make subfolders and sub folders beneath those. you can access with the creator no problem just can't add them to game play or groups without taking them back to the top level.
Generally only within the last year or so have custom sized .pngs be used. Otherwise most aka Bulk of the work is 252 x 352 (sizes can flucuate wildly..).. Use Faststone.exe to view / re-view quickly. If you like MS-Paint I recommend Paint.NET and plugins. easy backgrounds and Foreground border art without PS or Gimp usage (aka Transparency).
for .zipmods? I say use KKManager for your OWN sanity. Should find it from ManlyMarco. Otherwise get intimate with SB3Utils.exe
First thing is first. grab the 3.1 - 3.2 update.
And before I forget.. Remember the white manaquin cards are /Coords not /Chara. Still same dimensions though.