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I tapped download and install manually option in Windows Phone store and I downloaded an xap file. I transferred the xap file to my Lumia 435 via bluetooth, but the OS does not install it, displaying "Cannot install company app..." I checked out This Microsoft Thread on how to install xap files. It says, "Tap more option on apps list and then tap install local apps (or SD card)." I don't see any such option in my apps list.

marked as duplicate by Neil Turner, Thomas, Indrek, caschw, Rowland Shaw Apr 26 '15 at 16:27

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The XAP file is signed using a certificate - most likely from Symantec. That certificate has a corresponding AET - Application Enrollment Token. You need to distribute the AET together with the XAP file in order to allow installation (Microsoft calls it a sideloading process).

Assuming this is XAP that you got internally, just ask the developer for the AET. if it is XAP that you created as a developer, find out how to generate it here

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