Download the script of random swatch fill from http://vectorboom.com/load/freebies/freescripts/randomswatchesfill/22-1-0-167

Opened my illustrator CC2019>File>Scripts>Other Scripts, chose the downloaded file and pressed open, nothing happened.

Tried drag the script file directly into the folder of the software, this time script showing when I opened the script panel, but still no effect applied when I clicked it.