You can directly install the app (Quickly Recent Apps) from the apk or install it from Google Play (if you have Google play installed on your Nokia X).
You can also download another app which is like Google Play, named 1Mobile Market. I used it to download the multitasking app (Quickly Recent Apps) to Nokia X as I didn’t install Google Play yet on the device.
[alert variation=”alert-error”]Use the File at your own risk[/alert]
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Download here for the Multitasking App apk (Quickly Recent Apps)
Download here for the 1Mobile Market