I installed VS for Mac on a clean High Sierra machine and got a failure related to the HAXM install. Hit retry and the install completed. However, I found that HAXM wasn't available.
Looking around, it seems there might be a security-related problem with HAXM on High Sierra. There's a new version of HAXM out, which seems to be High Sierra friendly.
Anyone else had issues? Is manually updating HAXM the fix? I don't want to mess up future updates of VS for Mac.