I'm a US resident - Is it Safe to Order TurboTax from a UK Online Retailer?

My partner and I are US residents and use the same TurboTax Premier download each year. He just ordered the 2022 Premier online from a place in UK called Big Home Tax. It was a great deal at $45.99 in US dollars, but I'm worried there could be issues with malware, etc. He has already downloaded on his PC and it cleared his virus scans, etc. Has anyone ever safely and successfully used a downloaded version from a place like United Kingdom?