I am trying to download stardog version is 4.2.3 from your website. As soon as I input my details (email, name , organization) and click on “Download” button , I am taken to another page that reports 401 ReCAPTCHA failed error. There is no Captcha on download screen.
You must be seeing a cached page because it should be showing a download for 5.0-beta. The new version also includes a capcha. Try forcing a page reload and you should see it.