you may have to squint to see the difference on the screenshots... decide yourself if its worth the file size.
transparent textures up scaled too

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Install:
copy all "z_JAx4_*.pk3" files to X:/path_to/JediAcademy/GameData/base
only tested with OpenJK

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BEWARE OF LOADING TIMES!!!!1
even on SSD it.will.test.your.patience.

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Some Textures did not scale up well with the outcast model, consider also using "JKA_Tex_Overhaul_0.3" Moddb.com
load order of pk3 files is alphabetical, rename files so that JKA Tex Overhaul files are below JAx4 files.

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Possible issues:
while playing, after reloading several times i got white screens. not sure if its related to this mod, reshade or other things.
restart game will fix it until next white screen. i applied 4gb patch to the OpenJK exe files but i don't think this helps,
got 1 white screen after patching maybe would have gotten more but game was over by then...
maybe there are still some visible texture seams.. fixed a few, feel free to report extreme cases of visible seams.

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Credits:
ESRGAN - by Xinntao - Github.com
IEU Winforms - by ptrsuder - Github.com
Outcast ESRGAN model - by TreeMarmot
Moddb.com