Default Help Needed about KNOX APK files?

HI

I was using Airdroid to see whether I can download or retrieve its APK files.
I did.

But my question is this.

What if I decide to Uninstall KNOX and then re-install it WITHOUT actually waiting for it to be downloaded?
Can I just run those KNOX APK files on the S4 device without re-downloading the KNOX installation files again?

So, in other words basically, can I install KNOX without actually downloading it using an APK files?

Please see the attached images.
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