According to this,
"For EPM System Release 220.127.116.11, Smart Space is not released."
It means that unfortunately it is not released for 18.104.22.168 too...
To install last released version of smart space (22.214.171.124), you may do the following:
1) Prepare clean windows (or unix) installation.
2) Download and install 126.96.36.199 version of Smart Space, without any other components (Foundation, etc)
3) Perform "new installation" of 188.8.131.52 EPM release, including all needed components, into the same HYPERION_HOME. All common parts from previous release will be updated.
4) Configure Shared Services and then Smart Space.
You can find installation tool and needed Foundation archives on this page
Excerpt from page:
"Important Note: In order to install Smart Space, you must download the EPM System Installer and Foundation Services (parts 1 and 2) located in the Foundation Services page. For installation instructions refer to Chapter 2 of the Smart Space Configuration Guide."