Hi Carlos,
This problem may be because you have connected new hardware to your computer since it was last used, which overwrote its driver.
Since I have neglected the description of the solution (which I have since replaced on my web page) the following is:
It has never worked for me before with version 0.4.3.5, which is because my operating system has not been successfully updated.
Since then I have reinstalled the operating system (win7-32 ​​bits) by installing the service pack and then installing the Ms VC ++ multipack. I installed the driver at the same time as ST-Link was installed. After that, the latest version of AntScope became operational.

Edwin has suggested upgrading the firmware, which you can find a lot of information on KD8CEC and DH1AKF - you can find links on my website. (by clicking on bold text).

I hope I was able to help you with the solution.
I wish you a successful fix.
 73, Gyula HA3HZ