Installing downloaded apks from external site I have just downloaded APK files of a software from a website to my laptop. My question is if I install this on my phone, will it be installed in the phone memory or in the SD card memory?

I couldn't find any related question, so asking here.
Any apk files installed in your device usually stay on its internal memory. The apk configuration defines whether the app should stay on the mobile's internal memory completely, or it may shift a few resource files (images, etc.) to the sd card. The main files (technically: the java class files and layout files) remain on the internal memory of the device. 

This may be changed if your device is rooted, and you have partitioned your sd card to allow installations on it (technically: EXT4 extension replacing the FAT32 extension of a part of your sdcard, which won't be accessible to the user from the device as a Mass Storage).

Apps2SD is an app which eases the process of shifting apps capable of transferring resources from apk to sdcard, so as to free up some memory on the internal memory. The app does not help install apks on sd card.
Hope this helps.