I am not able to download the apk file in the phone after I download it from mit app inventor.
Where is the apk, on your computer or on your phone ?
I find it easier to build the apk to get a QRCode, then use AI2 Companion to scan the QRCode and install that way.
Right now, it is on my phone where I downloaded it but it is showing "App not installed"
One of the reasons why "App not installed" appears is when the memory of the mobile is full, it just happened to me 
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Do you have a different, previous version of this application on your phone? It is possible that the version that is already on the phone has a higher number than the one you want to install. Uninstall previous versions.