@The Real Swim 

They will only accept to purchase additional seat for supporting versions (i.e 2022-2024). You can call their sales team by phone to purchase QB Desktop 2024 Pro Plus or Premier Plus. If they refuse to offer any of it, you can contact @Fiat Lux - ASIA and they can help to obtain the license + you can get $100 cashback. You can also ask them to provide the trial code of QB Desktop 2018 and 2021 to upgrade your company file gradually.