From IK Support Team
First step worked like a charm
First, please check your Documents > IK Multimedia > IK Product Manager folder. You will see the downloaded product name in a folder, open to view the downloaded installer. Run the installer found here.
If the above step fails to install properly and the same error is given, then please do the following:
1. Visit
http://www.ikmultimedia.com/userarea2. Login and click on 'My Products'
3. Locate your product by name
4. Click the 'Past Releases' button for that product
5. At the top is the 'Current Release', download this installer for your Mac
6. Run this installer
7. Use the IK Product Manager to authorize.