Thank you for your report @cvd . I believe it has to do with an outdated certificate, which is in the process of being replaced. It’s also the reason why the 3.0-RC also doesn’t have a Windows download yet.
Does anyone want to automate a test to catch this on the build server earlier?
Okay, we got the certificate - and I have uploaded the signed windows installer to Source Forge. Can you test and confirm it works please?
That said due to some increased security building the windows installer is no longer smoothly integrated with build.geoserver.org - so this required a manual step of me uploading to source forge (sigh).