Exclamation TWRP fails to open zip file cannot flash ROM

hello, I've got a problem with flashing custom rom (4.4 beanstalk one) on my gs3 i747

TWRP keeps saying failed to open .zip file.

Now I havent tried other ROMs and maybe my guess could be a bad download

Any help would be appreciated

P.S. I also used TWRP manager to try to install zip directly but it does not show my sdcard, only the internal memory