Ok thanks i will follow your instructions .. only i do not onderstand this part:
In "select Map Product" field, select "Custom mapset". Open "Garmin_Week_calculator_TMC_MOD.XLS". Type number in "Enter Week Number". "Real Last working Day" field will give you the date when your new subscription would expire. Type "Enter week number" in kg.
And where is the Garmin_Week_calculator_TMC_MOD.XLS ?
regards