You may receive this error when trying to install EQ8:

“The source installation for the product Electric Quilt 8 is out of sync with the client package. Try the installation again using a valid coy of the installation package.”

To resolve this error, you’ll need to use a free Microsoft tool to uninstall EQ8. Click here to download that tool. Follow the on-screen instructions for Uninstalling EQ8 using that tool.

After that, try installing EQ8 again.