I am searching for alternatives to autoupdating our software. Not ClickOnce and nor in the line of wyBuild and wyUpdate.
Try these:
AutoUpdate+ [This one seems to have disappeared]
IncUpdate
Advanced Installer Updater
Sharp AutoUpdater
AutoUpdate
AutoUpdater.NET
NetSparkle
I use IncUpdate. It doesn't seem to be being updated anymore--but it continues to meet my needs (I released an update with it today).
I know it doesn't quite meet your requiremenets but maybe take a look at Omaha (used for google update), to quote:
Omaha is the open-source version of Google Update, a program to install requested software and keep it up to date. The Google-branded version of Omaha is used to support software patching (both background updating, and on-demand update checks) for Google Chrome, Earth, and a variety of other Google products on Windows.
We know that keeping software updated is both important and hard, and so by open-sourcing this project, our hope is that perhaps we can help others solve this problem. So, if you'd like to get involved, or even use Omaha to support your own software projects, then just follow the instructions in the Developer Setup Guide, and you'll be good to go!
Check NetSparkle
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With