FILE COULD NOT BE OPENED

Bought it after trying every possible program and converter and reader for .djvu files I could find. Every .djvu file I try a little message pops up and tells me the file cant be opened. No explanation, no error code, no troubleshooting. Waste of my hard-earned money, no refund, no solution, back to square zero. Thanks for nothing.

Ace, the belayer about DjVu Reader Pro