FW Real Estate installs as a single package file: pkg_fwrealestate.zip. Upload it through the standard Joomla installer at System → Install → Extensions → Upload Package File.
The package contains two extensions that install, update and uninstall together as one unit:

Installing the package does the following:
Every manifest is set to method="upgrade", which means re-installing the package over an existing installation is a normal update — not a clean wipe.
The table below shows which paths the package writes to and which are preserved across updates:
| Path | What is in it |
|---|---|
administrator/components/com_fwrealestate/, components/com_fwrealestate/ |
The component itself — replaced on update |
media/com_fwrealestate/lib/ |
The shared engine — replaced on update |
media/com_fwrealestate/addons/ |
Your installed add-ons and designs — kept across updates |
images/fwre/ |
Property photos, agent portraits and their generated thumbnails |
Before any update, back up media/com_fwrealestate/addons/ and images/fwre/ together with your database. These three items contain everything that is not replaced by the installer — your add-ons, your designs and all uploaded images.