You can change the paper size in Step 2 of the TransferRIP.
At the bottom the window, between the “Delete” and “Next” buttons, you can find a drop-down menu for the paper sizes. Please choose your “Letter” paper size media by clicking this menu. Your Letter media size appears 5th in the list of available media sizes.
NOTE: Before importing images into the TransferRIP, please choose your paper size and then import your image. The TransferRIP imports your images using the chosen paper settings.
If you have any further issues, please let us know.
Daniel – FOREVER Support Team