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Jackson Labs users: contact Jackson directly for your copy of GPSCon that works only for the Jackson GPSDO receivers.
If you're using Internet Explorer, there may be a setting that's blocking the download.
Take a look at the following steps (see to it that Allow software to run or install even if the signature is invalid is checked):
Open Internet Explorer.
On the menu bar, click Tools and select Internet Options.
In the Internet Options window, go to the Advanced tab.
Scroll down and check Allow software to run or install even if the signature is invalid. (If it is already checked, toggle it: Remove the check mark and click OK to save it. Start again at step one. When you reach step four, put a check mark on it again.)
Click OK to save the settings.
Close the Internet Options window, and close and re-open Internet Explorer.
Try downloading the application again.