Since you are not using the WP Fastest Cache “Browser Caching” option setting then do these steps below to make the BPS message go away.
1. Go to the BPS Pro > B-Core > Custom Code tab page.
2. Click the Root htaccess File Custom Code accordion tab/button.
3. Copy this WPFC placeholder/marker text below into this Custom Code text box: 1. CUSTOM CODE TOP PHP/PHP.INI HANDLER/CACHE CODE
# BEGIN WpFastestCache
# END WpFastestCache
4. Click the Save Root Custom Code button.
5. Go to the BPS Setup Wizard page > click the Pre-Installation Wizard and Setup Wizard buttons.
Note: WPFC has made changes to their code recently. So I will need to change the BPS Setup Wizard AutoFix and AutoSetup code for WPFC in the next BPS/BPS Pro versions.