You can install on unsupported as long as you atleast have a first gen "i"-cpu or later. Popcnt came along with socket 1156 and upwards. I have dual Intel Xeon Processor X5660 and it works perfectly fine. And my old all day laptop works too. A Fujitsu Celsius H700 with 8gb ddr3 and a Intel Core i7-820QM in it.
Yes, you need to have a Motherboard that has the Bios settings for TPM & Secure Boot & you must enable them. I just built 3 new systems using Asus ROG Strix B550E, B550XE, & B550F Gaming Motherboards with a Ryzen 7 5800X CPU, & all 3 systems are compatible with Windows 11.
i have i7 6700k cpu but after updating then restarting my pc. i got stuck at 48% on 24h2 update while booting. but i already turned on tpm 2.0 at the bios settings
I have an 8th gen I5 and when I enable secure boot sometimes the video isn't detected at boot and it blank screens So I can't I still can't run it supported.