Update (OP would be updated later) v1.9.4
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(codename "Unity finally got repacked?"): highly experemental, compresses only images inside .assets.resS and .assets; .unity3d archives, WebGL games and created with version newer 2019 not supported! Based on latest free version of UnityEx. Paid UnityEx version offers more funtions (newer Unity versions support, sounds and maybe .unity3d) but I don't have it anyway (as 99.999% of UAGC users) so can't implement those paid features.
Known bugs: on big (>1Gb) asset files UnityEx crashes, u need to kill its process in task manager and all would be fine after that. Not bug but a problem at least - Windows defender most likely would be angry (virus alerts) coz Repack uses .bat files.
P.S. Use it on ur own risk - I just wanted long time ago to create proper Unity compressor and somehow made it.
Repack example of
this game
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(151MB repacked vs 437MB original).
Not supported games: Lust Man Standing (maybe coz contains # in image file names).