The link to the driver on the Hauppauge Support Page doesn't work for me either.
I have the latest driver (22xx_220.127.116.11297.exe). I've placed a copy in my Dropbox. If you PM me, I'll send you the public url so you can download it.
I have to say this...
I assume no responsibility for anything that might happen as a result of your use of the driver.
From the Hauppauge Support Page...
Leave your WinTV-HVR-2250 plugged into your PC. Follow the following steps:
Download the WinTV-HVR-2250 driver update: 22xx_18.104.22.168297.exe
The file is self extracting just click to install.
This will install the WinTV-HVR-2250 base driver.
At the completion of the driver install, you should see a message which says Drivers have been updated successfully.
Size: 8 MB
Samsung UN65JS8500 65" SUHD TV FW1455; Yamaha RX-A750BL Receiver FW1.77; Samsung UHD-K8500 UHD BD player, FW1005, w/dual HDMI; one to TV (video), one to AVR (bitstream); Arris DCX-3600M Cable STB; Nvidia Shield Android TV Update 3.2, Server: Windows 10 Home and Emby Server.