Windows Upgrade Help and more

Yeah, You could also check if you need a BIOS update first, as that can sometimes enable the TPM support.

I had the same problem. After the BIOS update, I found the fTPM setting under a security tab I'd totally missed before.

You could also try using the official Microsoft PC Health Check app to see a full breakdown of what's specifically blocking the upgrade.

Yeah, that checks out. A quick tip: if you do get it installed, try disabling some of the new visual effects like transparency and animations, it can help a bit with that sluggishness.