Make sure you download them in the Sygic format.
Un zip them and copy the bmp and upi files to the folder Sygic/Maps/import.
Start Sygic and it will prompt you to click OK to import.
If you do not have the folder "import" make it.
Then copy the the bmp and upi files to it.
Once you have done that you will need to go into the settings and make sure they are turned on.