"Attach the license key." is displayed when launching PE-ViewX.
Do you check the following points?
* Is the license key, on which "PE-ViewX" is discribed, attached to your PC?
* Does the license key light on red?
If the license key doesn't light on red, you need to install license key driver to your PC.
For details of installing key driver, refer to "4.3 Installing Driver of License Key" of