Running Live update on a dial up connection

Hi, I have tried to run live update on a dial up connection, but I'm having problems.  According to the message I get when live update starts I have just under 91 mbs to download.  This morning I downloaded 30mbs when my ISP cut the connection and when I tried to start again, it told me I still had 90.25mbs to download.   Is there anyway I can get it to download in say 20mbs chunks as my wife needs to use the phone sometimes and she gets shirty if the computer is tying up the phone all day.

 

Thanks

Ted