If you lack the port for this operation, then you can simply buy an adapter which corresponds to the port used and then the other end to be a simple USB. You insert the USB into the PC or vice-versa and continue using the application you bought back in 1989. The problem appears when you're trying to use a modern operating system, because the above procedure will be useless if the application doesn't have any updates, and sadly it doesn't.
You have to check your local IT store to buy these adapters and the developers to obtain an official statement related to the availability of the application: http://www.acceltechnologies.com/contact-us.shtml