I'm sorry to say, but you're most likely not gonna get Miriam in any legal form now. I don't see any sales of her on Ebay and Amazon: Zero-G themselves has her listed as unavailable (she's not listed on the official Zero-G site either). Vocaloid 1 has been discontinued. They're not being sold in any form and those who were fortunate enough to get them when they were available - they're gonna hold onto Leon, Lola, Miriam, Kaito 1, and Meiko 1 for dear life. If there was the possibility of updates for the English V1 banks, it would have been announced by now, but Zero-G's already working on a new male vocal similar to Avanna.