Normally download binaries from:

https://github.com/vslavik/winsparkle/releases/download/v0.5.6/WinSparkle-0.5.6.zip

Repackage to kodi format... :)

Currently we use the source from https://github.com/vslavik/winsparkle v0.5.6
with this commit on top
https://github.com/vslavik/winsparkle/commit/78f865461f85ba72b8b69e637927e280856ad122

and compiled our own via VS2015.