I hear alot of what are the newest versions of eventscripts or es_tools and it is kinda not usefull to answer that seperatly everytime. Here you will be able to find the newest versions and what you need to get wcs to work properly and fully.

First of all you will need eventscripts
and after that you need es_tools
and ofcourse you need wcs(the link is the newest non python version of wcs)

When you downloaded all these files open your cstrike folder and unzip all 3 of these files into that folder.

If you have unzipped all these files go to your cfg folder and open the autoexec file. When it is open look if there is a line es_load wcs. If it is there go further on with the installation and when it is not add the line and then move on with the installation.

If you want to be able to restrict weapons open the file es_tools.cfg in your cfg folder and search for the line :
then change that to this:
Now weapon restrictions will be functional and everything should work just fine.

Now you can restart your server and you should be able to play wcs with all it's functions.

Have alot of fun