Official ISO download link from Microsoft, enjoy！
Visual Studio Enterprise 2015 with Update 1 (x86 and x64) – DVD (English)
SHA1：EB8DFC731EA4822E57483516BC059BC990260549
Direct ISO Link
Visual Studio Professional 2015 with Update 1 (x86 and x64) – DVD (English)
SHA1：E38C352F9E67B922C9F6A90A98E9C28048CE8D15
Direct ISO Link
Visual Studio Community 2015 with Update 1 (x86 and x64) – DVD (English)
SHA1：FB5AE6B57BDC495AFB29646AFCA088756363A263
Direct ISO Link
Visual Studio Team Foundation Server 2015 with Update 1 (x86 and x64) – DVD (English)
SHA1：9FD39A5E26C0FFA846F315E8DBEEED020AB2B38A (MSDN)
676E4394A4B91D2D2152FBDE78F806D49DF8813A (Microsoft Download center)
Direct ISO Link
Visual Studio 2015 Update 1 (x86 and x64) – DVD (Multiple Languages)
SHA1：5F7B12970B484265259397F9F4C3FDB75A8949F2
Direct ISO Link