PS Vita master / sub account

[Westy Carl]

HELP

I've no idea about gaming but bought my son a PS Vita for christmas. After taking the whole of Christmas day I managed to set up a Master / sub aco and download the packaged games.

However I've just purchased 2 new games on the master account (woouldn't let me on the sub account) but now can't download them to the PS Vita?

Any help would be grqatefully recieved to stop my 8yr old abusing me for being stupid.

thanks.
p.s. is it me or is the PS Network not very user friendly