Licensee agrees to pay Licensor within fifteen(15)days Of Licensor's sending an invoice to Licensee, the nonrefundable Advance plus value-added taxes or other applicable taxes there on, if any which shall be on account of Royalties to accrue during the Term only for each Property and only with respect to sales in the Territory ,at such times and in such amounts as specified in Section 1.1 above; provided ,however ,that if more than one Advance is payable during a Guarantee period specified in Section 1.13,then at the time the second or any subsequent Advance is due and Payable , if the difference between the cumulative amount of Advances theretofore due plus the Advance then due and