The most secure way is to use MikroTik’s own download servers. Take a standard download link and manually change the version number in the URL. Example for v3.41: https://mikrotik.com
Extremely old RouterBOARDs (e.g., MIPS-LE family like RB100 series) or older RouterOS licenses may require specific legacy builds to communicate correctly. download winbox older version
With the launch of Winbox 4, some veteran users still prefer the layout and "Detached Window" mechanics of Winbox 3. The most secure way is to use MikroTik’s
While MikroTik does not maintain a dedicated "old version" button, you can reliably find and download them using these methods: download winbox older version