Within the cubase directory...what should I install?

Looking at this directory path:

Cubase_Pro_8_Update_Installer_win\Cubase 8\Cubase 8 for Windows\Additional Content\VST Sound

And using a Win 7 / 64 Bit pro system. What should I select and install? Please attached graphic to explain:

some of the files have an _64 which I assume means 64 bit installer, while there are files with the same label without the _64. Are these the 32 bit equivalent? Which one should I install? Is there any harm in installing both of them?

Thank you all for your kindness and patience.