Ok guys it took me quite less than a couple of hours but I think that may have been a half-success.
I opened the zip file with hex editor and i located the file checksum (not the zip checksum but the squares_codes_07.jpg one). That checksum was 0x153D. I changed that to 0x1F5D (which is 8029 hex) and tried opening the file with that password again. Now the result says password incorrect. I attach here some screenshot and the newly generated zip file.
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