Tested it on 2 machines (all Windows) and with 2 Browsers (Firefox and Edge) but I cannot reach the real download page after filling out the form provided on the offical download page (Download | KNIME).
Hopefully it is working for you now @marcogertsch. I have tried it today on Windows in Chrome and Edge. btw on the download form you can just tick the final box 
I am also not able to reproduce it but that issues sound liek a validation problem (if I’d have to make a guess). Can you share a screenshot of your filled out form?
Just FYI - you do not have to provide anything, just ticking the checkbox and click Download works
2 Likes
I have the same problem, I can’t download KNIME, after I tick that box and click on download button, I’m redirected to download page where i can chose which download I prefer. when I click on download button i’m redirected on the previuosly page.
in the second download page there is also this disclaimer: " Microsoft Defender SmartScreen may block download in its attempt to prevent malicious software installations.
To solve the problem click here." but when i click on it the link redirect to a general guide page
I currently also have the problem of not being able to download KNIME from a business laptop. Is it possible that KNIME URLs got blacklisted in some general proxy lists?