I guess that it depends on exactly what you have, and how compfortble you are with making changes.
Ability systems is the name of the company. Their controller is called Indexer LPT. I'm assuming this is what you have? There's an optional g-code module for indexer LPT, which should allow it to read g-code from Aspire.
If the machine is running from the PC parallel port, with no hardware, than you could switch it over to Mach3 as well.