You will not install latest version on top of old version.

Latest version is for fresh install.

If you are upgrading, you need to find out which version you have installed, then upgrade to next release untill you reach to latest version. This need to be done in order.

You can find the version of your vshare installation in

README/VERSION.TXT

You need to check the orginal ZIP you have installed as you may have overwritten the one of server with that comes with vshare 2.4.