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

Flag: tjctf{sneakers_with_zippers_are_hip_no?_874d174bb26fcf95}