Can i buy unity 4?

We are using unity 4 free and we want a commercial licese for unity 4, but when the licens activation tab pop up it ask for a serial number. If i click on Buy unity pro then redirect me to this site https://store.unity3d.com/?utm_source=unity&utm_medium=license&utm_campaign=serial is this the unity version 5 or 4 or what? Pls help

why would you want to buy Unity 4 and not Unity 5?

I don’t have a link to official clarification offhand, but as far as I remember purchasing a Pro license provided access to previous versions of Pro. Perhaps someone could step in with a link to the official word on this?

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Because Beast lightmapping bake the objects instead of enlighteen witch is baking the whole scene. We working on a runtime level editor and when i duplicate a lightmappad object in unity 5 the new object cant recive any lightmap gi data.
Here is a pics what im talking about.

When you buy Unity 5 pro you get all previous editions. So yes you can buy 4 pro, by purchasing 5pro.

Thank you guys!