Can I directly update to Mac OS Sierra?

[khora02]

Is it possible for me to directly update to Mac OS Sierra if I have two OS's installed on one HDD?

Is no, would I have to do a clean install?

 

[RehabMan]

Is it possible for me to directly update to Mac OS Sierra if I have two OS's installed on one HDD?

Is no, would I have to do a clean install?

Update from what?

 

[khora02]

Update from what?

Update from El Capitan that is situated on the Mac partition of my HDD?