Is htere a guid for creating san for both www and non www cert? Or am I the only one that can not find it. Because I see no other thread about san certificate for windows iis 7
It all depends on which client you are using - you ideally need to follow this up with the author of the client.
All I needed to do was add --san swtich to letsencrypt.exe and it did the rest.
Good to hear you have it solved 
Can I ask what client you are using - so that it’s useful for others asking the same question. (There are many different clients out there, and all have different options )
Sure I wrote it. It is https://github.com/Lone-Coder/letsencrypt-win-simple