Have you tried the solutions described in this page?
If it does not provide you a solution, let us know.
Tried all listed solutions, Removing deep packet analysis changed the error to this:
Error e0706c: Could not authenticate. Check your internet connection. Failure: SSL handshake failed
no other results
This error may be the result of three possible problems:
A proxy server is used
If a proxy server is used you should enter the proxy settings following the instructions here: How to set up the Proxy Server Configuration
There is no internet connection.
Please make sure that there is an internet connection: Restart your internet connection and ensure that connection to the internet is available.
The computer is behind a firewall.
If the computer is behind a firewall make sure that the firewall is not blocking *.pix4d.com, via ports 80 and 443: For instructions on allowing access, consult your network administrator or your home network’s firewall documentation.
You can also check this article if you have not done it already:
If you still experiencing the same issue, the next step is to completely uninstall Pix4D Desktop and install the stable version once again.
Hope this will help,