Hello Bob - you may get two replies the same from me! I used V5 on a G3 Imac. Now have a G5 Intel and like you, cannot open V5. Got in touch with Leisterpro at http://www.leisterpro.com/http://www.leisterpro.com/ and they told me the upgrade is a full version 8. I am in UK and it cost £59.95. On their website have a look at the upgrade section as it lists all countries where upgrade can be purchased. Load it onto your computer and it will open previous versions. If V5 is on a different computer, just put it on a CD/disk or whatever.