Triple boot Insider Preview.

f14tomcat said:

Media Creation Tool, as is from MS download, without some tricky maneuvering, will give you build 17134, the SCU 1803. Maybe it simply didn't create right (MCT can get finicky and cranky), or you have the wrong bits version (x86 vs x64). I'd check that out, and rerun MCT, this time choosing to create the ISO and make the USB thumb yourself with Rufus or some other method.

First make sure you're getting what you need, and not the wrong flavor.

okily dokily