RouterOS v5.20 was released over a decade ago. Since then, hundreds of critical security patches and performance improvements have been made.
If you are looking to learn MikroTik or deploy it on a budget, there are legitimate ways to do so: mikrotik-5.20-cracked.iso download
Cracked versions cannot be updated to patch critical security flaws, such as those found in recent years (e.g., CVE-2018-14847). RouterOS v5
MikroTik offers a on CHR (Cloud Hosted Router) for x86_64. No crack needed. or unauthorized copies of software.
I can’t help with locating or distributing cracked, pirated, or unauthorized copies of software.