Apk you can put where you want, in to internal memory or in to external SD Card.

But you have followed these instructions ?
Spoiler: Jelly Bean instuctions

On JellyBeen or previous O.S, path for INTERNAL and EXTERNAL SD Card is the SAME, ALSO for KITKAT 4.4.X and LOLLIPOP 5 into INTERNAL MEMORY !!

PATH IS :
tomtom / com.tomtom.your country / files

Copy the complete tomtom folder in the External Sd Card root (or Internal Memory root.)

Install .Apk, quit from installer and restart your device. Start the software.

You still have this error ? "Impossible to connect to TomTom. Please try again later"
Recopy again .METADATA.XML file into >> com.tomtom.your country folder << and restart software.

If you don't see .METADATA.XML file, you need to enable the viewing of hidden files......

Don't use a PC with MAC O.S....

Data or wi-fi connection open or closed ..... makes no difference.....it works in any case !