0. Open CyberChef (https://gchq.github.io/CyberChef/)
1. Open file as input : chall.zip
2. Operations: unzip
3. Save output to file: download.dat
4. type/cat download.dat will flag (see first line)

Flag: **tjctf{sneakers_with_zippers_are_hip_no?_874d174bb26fcf95}**