, when I do double click, I get a message that asks "Do you want TurboCAD to be able to make changes to your computer". I've tried yes and no, but neither option results in me actually being able to open the file.
This is not the fault of TCad ... it is a Windows setup issue.
Windows sets up firewalls / accounts and all sorts of show-stoppers.
Basically .. somewhere with in the settings of Windows, is a "Trust" slider bar. Might be in Windows Security settings.
Find it and Slide it to the Left ... (Turn it OFF)
If your not computer savy >>>> Employ a Computer Tech, and set up your computer as THE ADMINISTRATOR.
Get rid of restricted Guests features.
Turn OFF all windows features that intercept your programs, as this is why you keep getting this >>> I get a message that asks "Do you want >program name< to be able to make changes to your computer".
That message indicates that windows is restricting access ... and generally causes more grief (Program issues / crashes).
To sum up ...
Update your computer to the latest OS of your version of Windows.
Update all Drivers.
Get rid of the firewalls and features of windows that keep asking you "Are you sure you want to do this"
Ask a Computer Tech .... They should know what to do.