Hi Lou
I had the same problem, but I could resolve it with the help of the Flexera support. Here's their answer:
Thank you for your email, As the project you sent me is a Wise project (WSI) you can convert this using the InstallShield tool (part of AdminStudio), First of all you need to open the WSI file with Installshield (Right Click the file and then open with and point to InstallShield isdev.exe),
Once this is opened do a ‘Save As’ and save this as an MSI, Once you have an MSI, Open Installshield and follow the steps in the following KB article to convert this into an InstallShield project,
HOWTO: Create an InstallShield Project from an Existing MSI/MSM File
http://kb.flexerasoftware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=Q200261 Attention! my problem was that I worked with the InstallShield 2011 evaluation version. You have to use the InstallShield in the AdminStudio 9.5 evaluation ???!!!
If you already have an MSI you can omit the first steps for converting, just follow the steps in the kb article. In Wise 5.21 I saved my WSI as MSI and started with thisone.
I hope this help,
Stefan