Windows 11 released on October 5th
Microsoft announces Windows 11 release date
Its a free update but its not been plain sailing for the beta. Testers have been bemoaning the fact that TPM is required and not all machines have TPM installed. The latest is that TPM 1.2 will work but you may not be supported (think no patches) unless you have a TPM 2.0 chip.
The official news is here;