Please check the Thumb lock position to your old Handle
How to check:
Look on the back of the inside Interior handle where the thumb latch passes through. There are 2 slots 1 marked "A" and 1 marked "B". If "B" (Lower Latch slot) is where your Thumb latch passes through you have an Offset Latch. If "A" (Upper Latch Slot) is where your Thumb lock goes through? You have a Center Latch and this handle will not work. Here is the link for Sash Controls Center Latch products "center latch"
What is the difference between Sash Controls 2265 Offset and Center Latch Handles?
Look Closely and you will notice the Thumb Latch position is different.
13-291 series is located directly CENTER of the 2 mounting screws CENTER LATCH
13-245 series is located BELOW center of the mounting screws OFFSET LATCH