I did not receive any invitation but the Core Infinity upgrade was available when I logged in my account on the Devialet website. So I just ordered it.
PS Audio P3 - Devialet Expert 250 Pro CI - Tanagra Audio Iris - Micromega CD-30 - Roon - Mac Mini - Entreq Silver Minimus Apollo Eartha RCA - Shunyata Omega Ethernet - Dela S100/OP-S100