I just downloaded Windows ISO Downloader version 8.46.0.154.
Using Windows 10 20H2 on a laptop with 1920x1200 15.4" screen (if that matters).
I'm wanting to download a Windows 10 ISO. So click the Windows 10 radio button at right-hand side. Text in the web view on the left-hand side is way too large. I can choose something from the Select edition drop-down and click Confirm.
The problem comes at the next stage. It says Select the product language but I can't scroll down to reveal the drop-down box for that. Or rather, I can scroll down using the mouse wheel, but the view immediately jumps back to the top. The ISO Downloader program window is not resizable so I can't just make it bigger.