Always verify the hash of your downloaded executable. The official MD5 for Winbox 3.18 (released roughly October 2015) should be checked against community forums to ensure you haven't downloaded a trojan.
While MikroTik has released numerous newer versions (from 3.20 all the way to the current 4.x beta branch), version 3.18 holds a legendary status. It is not just abandonware; it is a functional, lightweight, and uniquely capable tool still actively used by thousands of engineers in production environments. winbox old version 3.18
Have a war story about Winbox 3.18 saving your network? Share it in the comments below. Always verify the hash of your downloaded executable