I downloaded this and extracted nano from the url below via midnightcommander. In windows, 7-zip can unzip this rpm file. Copy the binary nano-file found in ./usr/bin/ directory onto your esxi 6.5. Probably put it in directory where you got other executables, like in /bin or /usr/bin.

For windows users, the winscp client is great to copy the nano into the esxi host. If you run linux, just scp the binary to your server like this:

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scp nano root@esxi:/bin/nano

http://download.opensuse.org/distribution/11.4/repo/oss/suse/x86_64/nano-2.2.6-3.1.x86_64.rpm