The first step of the Flexor install involves unpacking (un-zipping) itself to a temporary folder on your PC. If your Flexor installation fails with this error, it means the installer is not being allowed to unpack itself to the temporary folder. To resolve this, please download the ZIP file of the latest version of the Flexor installer from our Release Notes page.
This will allow you to un-zip the installer to a location on your PC of your choice. Once un-zipped please run the Flexor installer from the location you have specified, the installation will then proceed as normal.