Issues transfering .apk files from PC to phone using the cable. Sony Xperia Neo I want to transfer some .apk files to my phone to install the applications on it. 

I've tried many ways of downloading and installing applications on the smartphone but to no avail, so I think this method is the easiest one for now. 

The problem is whenever I transfer them to a folder (browsing the phone memory like a USB) I cannot find them on the phone or there is no installation available. 

Where should I paste those .apk files on my smartphone to be able to install them? 

My phone is sony xperia neo l. 

Is it the same for other smartphones?
Use a SD card and put the APK file on that. Put the card into the phone (if it supports it) and open the files folder on your phones File Browser (Could be something differently named). Install it as if it were another app.