Besides using the "Next" and "Previous" buttons, the user can click directly on the step in order to navigate. At any step the user can navigate only to the immediate next step or any of the already visited steps.
Demo:
https://www.silkypress.com/woocommerce-multi-step-checkout-pro/
https://www80.zippyshare.com/v/7NG56hCM/file.html
http://ul.to/awwjqrc8
https://www.mirrored.to/files/1Z6J5ZIV/silkymultistepcheckout-226.rar_links
https://krakenfiles.com/view/ORScEP8fI5/file.html
https://hxfile.co/96mbiz8h3me8
https://gofile.io/d/Ps9SGg
https://www.fireload.com/c3683d468449fb1f/silkymultistepcheckout-226.rar
https://evoload.io/v/QY2ipbjeO5w9CC
https://drop.download/ow1ad3jv2pq5
https://ddownload.com/ze984zi97gp9
https://bayfiles.com/Z7Q9pcZ0u6
https://anonfiles.com/f4R8pdZbuf
https://1fichier.com/?y5wghpxd7o95aq23g089
This file has UNTOUCHED status - (original developer code without any tampering done)