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NSIS INetC plug-in

The INetC (Internet client) plug-in is a NSIS plugin downloading and uploading files. It is based on the InetLoad plug-in. The network implementation uses MS WinInet API, and supports the HTTP, HTTPS and FTP protocols.

Note: There are some unfortunate issues with MS WinInet API, as it is based on using parts of the long abandoned Internet Explorer. This means that IE users settings (Proxy settings etc.) will apply to this plugin as well. In addition, it's not exactly up-to-date in many respects - and it will only support TLS 1.1 on Windows XP for example. There now exists an alternative plugin NSCurl that uses libcurl and OpenSSL instead of WinInet. While I haven't personally tried it, this might be a better solution for many.

NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution.

This is a modified version of Since I couldn't find a source repository, I've created a Git repository and committed the downloaded source files. These changes would otherwise have been submitted as a pull request or patch. I couldn't find an explicit license for INetC plug-in, which means that this is licensed implicitly with the zLib License according to the NSIS license.

Changes in this fork are:

  • - Added options /TEXTCOLOR "RRGGBB" and /BGCOLOR "RRGGBB"
  • - Created a 4th download dialog /MODERNPOPUP
  • - Created option /NOSSL which prevents redirects from HTTP to HTTPS
  • - Applied changes from upstream /tostackconv supports UTF-8 and UTF-16LE BOM sniffing and conversion.
  • - Fixed download progress for files larger than 2 GB (thanks @pjpuchyr) and reverted changes that broke /WEAKSECURITY.