edit:
Starting from visual studio 2017 Microsoft is no longer offering .ISO images. For the new visual studio 2017 you have to download vs_community.exe from here and create an offline instalation folder:
vs_community.exe --layout c:vs2017offline
Then, in order to install from that folder you have to first install certificates from certificates in the download folder and then run the installation.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…