I downloaded Arduino editor from arduinos homepage. I followed a troubleshooting guide on arduino webpage to find the port (This was the first problem, that I couldnt see a port, it was greyed out in the editor -Tools-Ports)
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There are a lot of Nano clones that use a different TTL-to-USB chip. You will have to identify the chip underneath the board; the most common one is the CH340 and you can download the latest driver from the WCH website. You can find instructions on this SparkFun page; the driver can be found on the wch website.
If you have a different TTL-to-USB chip (CPxxxx), the above is not applicable and you will have to dig a bit more yourself.