vs2015 won't work with 0.8.4, you always need to use the version specified in the download page in the setup guide. for 0.8.4 is vs2012.
you can also use the 0.9RC or the latest nightly build which will work with vs2015
vs2015 won't work with 0.8.4, you always need to use the version specified in the download page in the setup guide. for 0.8.4 is vs2012.
you can also use the 0.9RC or the latest nightly build which will work with vs2015