Please confirm your version build number. I'm only showing build 06 being the most resent for your region.
http://www.dlink.com/ro/ro/support/product/dir-826l-cloud-gigabit-router-n600The last time I check my 826L here in the NA region was using v1.02 and SharePort v4 with my HP LaserJet P2014n. All I did was a sample test file from the Windows Print driver and it was working for me. I didn't do anything else. I believe I received information regarding that officially D-Link printers were not being supported on this model router. Only USB flash drives and USB HDD drives. 500Gb max size.
One other solution if you need a USB printer to work with this model router would be to get into a LAN Network Print Server adapter. Connect the USB printer to the adapter and the adapter to the LAN port of the router. This adapter will convert any print jobs from LAN networking to USB for the printer to print with. You can connect up any PC to the print server and send the print jobs to the print servers IP address. This is a good alternative and they are not that expensive either.
Give the SharePort v4 SW a try with your printer and PC, if it works then you'll be lucky, if not, try the suggested alternative.