Many time problem occurred when installed CorelDRAW X8 and then open CorelDRAW X8.
Open only Login Screen every time or can't open CorelDRAW. So, We can provide below steps for resolve this problem.
Step-1: Open following Path: "C:\Program Files\Corel\CorelDRAW Graphics Suite X8\Draw"
Step-2: Right Click on "RMPCUNLR.DLL" file and Click on "Rename" option
Step-3: Rename the like as "RMPCUNLR1.DLL".
Step-4: After Rename, Open CorelDRAW X8, It's fine working