I have been playing regularly since March on Samsung Galaxy Tab 7.0 (Android 3.2), with NO problems.
Installed 4.4.18 yesterday. The buildings have no texture, and the game freezes every minute or two. It is now unplayable.
Where can I find the previous version?

Have you tried clearing the App's cache data? (Settings - Apps - Dogfight - Clear Cache)

Have you tried tinkering with the graphics settings?

Have you totally uninstalled, and reinstalled?

let me know if any of these help