Try downloading virtual clone drive. It creates a virtual cdrom drives that allows you to mount ISOs. Its free, but not open source, and it works very well. There are other alternatives out there as well, you can just google them. I keep ISOs of all my CDs and DVDs on a network drive and just mount them as needed.
Unfortunately, some antipiracy software built into some software will detect these virtual drives and prevent the software from working. Its very rare though.
Worst case, contact the manufacturer of the software and explain the problem. They might give you a workaround.