Is there anyway to purchase a unity 4.6.1 pro license?

I´ve noticed that there are some problems with some sdk and unity 5. So I was hoping to purchase the 4.6.1 pro license (the monthly license) and use that version until unity 5 has full integration with my needs as a developer. Is the Unity versio 4.6.1 available for purchase?

you would have to purchase the latest version then you could download the older versions from here