> For the complete documentation index, see [llms.txt](https://docs.rmhpos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rmhpos.com/installation/install-central-manager-multi-store/backward-compatibility/backward-compatibility-installation.md).

# Install the Backward Compatibility Extension

For non-Flash stores, you must install the Backward Compatibility Extension **on the same computer** where your installed both the RMH Central Flash Server app and the non-Flash RMH Central Server app.

1. Go to the location where you extracted the release package files.
2. Double-click **Setup.exe** to open the setup wizard.

{% hint style="info" %}
You must have administrative privileges on the computer to install RMH apps.
{% endhint %}

<div align="left"><img src="/files/z88O0hVubWK52sbMlrYe" alt=""></div>

3. Under **RMH Flash Backward Compatibility**, click **Install Flash Backward Compatibility**.

{% hint style="info" %}
Alternately, you can go to the **RMH Flash Backward Compatibility** folder and double-click **RMH.FlashBackwardCompatibility.Installer.msi**.
{% endhint %}

4. Click **Next**.

<div align="left"><img src="/files/R12lIOOVTfs2alFdkaVN" alt=""></div>

5. On the **End-User License Agreement** screen, select **I accept the terms in the License Agreement** and click **Next**.

<div align="left"><img src="/files/yt9y04qbphu5bok8eYkY" alt=""></div>

6. On the **Destination Folder** screen, select the installation folder for the Backward Compatibility Extension and click **Next**.

<div align="left"><img src="/files/0c8zPj1LGP7cfhiPwLzv" alt=""></div>

7. Click **Install**.

<div align="left"><img src="/files/l81fIZjT0jn2bTN99gs3" alt=""></div>

8. Wait while installation is completed. This may take a few minutes.
9. Click **Finish**.

<div align="left"><img src="/files/ezgJhKqdyPzETwW4kBLt" alt=""></div>

10. Complete the setup of the Backward Compatibility Extension. Refer to Identify the stores that are Flash and non-Flash and Turn off the worksheet processor service for more information.


---

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