ZBrushCentral

How do I update from Zbrush 4 to Zbrush 4r5?

I just reformatted my main system OS, and the only installer I have for Zbrush is version 4.

How do I get it back to version r5? I can’t find any ways of doing it through the Pixologic site.

https://pixologic.com/zbrush/downloadcenter/instructions/