To get this ATI THEATER 650 PRO working in Windows 10 or Windows 11: Download the zipped ISO below, and mount the image in Windows. On the root of the CDROM run Atisetup.exe select Properties select capabilities Windows XP SP3 then Run Install as Administrator, restart and catalyst media center should be in your startup programs.
ATI Unified AVStream Driver
File: 6-6_xp_t550_wdm_33678.exe
117e58d73b4cda84d32666349994ec5dcd524baa2875a97a56569c50004bb49c
ATI THEATER 650 PRO Driver CDROM ISO
File: 180_V01123_100.zip
cfa71e36da750abcda5a7874673b98115fb3f9b5d6345858ece99b5a778c5473
ATI Unified AVStream Driver
File: ATI_Theater650PRO.zip
20c39fc1506c6fd9eb4e116f9b1786d6aa8e0d0de5e385693e1220fca8e79e10
ATI Unified AVStream Driver
File: 10-4_xp32-64_unified_wdm.exe
40808af31b0656177622bdb714ede8d598f3fa900e2d9853791dd5f2564fd81d