Visual Studio 2015 Update 3 Offline Installer (ISO)

You can check Visual Studio Downloads for available Visual Studio Community, Visual Studio Professional, Visual Studio Enterprise and Visual Studio Code download links.

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Update!

There is no direct links of Visual Studio 2015 at Visual Studio Downloads anymore. but the below links still works.

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Visual Studio 2015 direct download links (.iso):

• Visual Studio Enterprise 2015 with Update 3 (7.22 GB)
• Visual Studio Professional 2015 with Update 3 (7.22 GB)
• Visual Studio Community 2015 with Update 3 (7.19 GB)

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VSCode area:

• Windows

  • 64 bit: User Installer | System Installer | .zip
  • 32 bit: User Installer | System Installer | .zip
  • ARM: User Installer | System Installer | .zip

• Linux

  • .deb: 64-bit | ARM | ARM 64
  • .rpm: 64-bit | ARM | ARM 64
  • .tar.gz 64 bit | ARM | ARM 64

• Mac

  • .zip: Universal | Intel Chip | Apple Silicon

[UPDATE]
As per March 7, 2017, Visual Studio 2017 was released for general availability.

You can refer to Mehdi Dehghani answer for the direct download links or the old-fashioned ways using the website, vibs2006 answer
And you can also combine it with Behrouz.M answer to make it a complete full standalone offline installer.

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Note:
I don't condone any illegal use of the offline installer.
Please stop piracy and follow the EULA.

The community edition is free even for commercial use, under some condition.
You can see the EULA in this link below.
https://www.visualstudio.com/support/legal/mt171547
Thank you.

Instruction for official offline installer:

1. Open this link

https://www.visualstudio.com/downloads/

2. Scroll Down (DO NOT FORGET!)
3. Click on "Visual Studio 2015" panel heading
4. Choose the edition that you want

These menu should be available in that panel:

• Community 2015
  
• Enterprise 2015
  
• Professional 2015
  
• Enterprise 2015
  
• Visual Studio 2015 Update
  
• Visual Studio 2015 Language Pack
  
• Visual Studio Test Professional 2015 Language Pack
  
• Test Professional 2015
  
• Express 2015 for Desktop
  
• Express 2015 for Windows 10

5. Choose the language that you want in the drop-down menu (above the Download button)

The language drop-down menu should be like this:

• English for English
  
• Deutsch for German
  
• Español for Spanish
  
• Français for French
  
• Italiano for Italian
  
• Русский for Russian
  
• 日本語 for Japanese
  
• 简体中文 for Chinese (Simplified)
  
• 繁體中文 for Chinese (Traditional)
  
• 한국어 for Korean

6. Check on "ISO" in radio-button menu (on the left side of the Download button)

The radio-button menu should be like this:

• Web installer
  
• ISO

7. Click the Download button

The ISO file that suggested in the accepted answer is still not complete. The very complete offline installer is about 24GB! There is only one way to get it. follow these steps:

1. Download Web Installer from Microsoft Web Site
2. Execute the Installer. NOTE: the installer is still a simple downloader for the real web-installer.
3. After running the real web installer, Run Windows Task manager and find the real web installer path that is stored in your temp folder
4. copy the real installer somewhere else. like C:\VS Community\
5. Open Command Prompt and execute the installer that you copied to C:\VS Community\ with this argument: /Layout .
6. Now installer will download the FULL offline installer to your selected folder!

Good Luck