Help - Brush Conversion

I have Paint Shop Pro 8 & the extension for brushes is .jbr. I want to be able to use .abr brushes for the program, so I tried converting them using this tutorial, which uses a program called an Extension Changer, but when I go to imports it into PSP8, it still says the format is too new & unsupported. Is there another way to fix this? Please help, & thank you!