Where to install Omnisphere version 1.5.8d?

Hi , I’ve been having issues with Omnisphere loading very slowly or at times it is unable to load files saying the file is “empty”. I have reinstalled version 1.5.8d but when do the installation it skips over the “destination” selection and immediately goes to the “installation type” selection.

So, can anybody offer some guidance on this?

I’m using a Macbook Pro OS 10.7.5.

Many thanks , Jeff

I think I’m asking where to install the omnisphere.vst file.
thx Jeff