Just joined, can’t seem to get the download to work on Windows 10 64 bit.
I’ll keep trying 
If you have installed the Frtizing zip file and started it, then thought that it had hung and killed it, you likely need to delete these two directories to fix it up. If you interrupt the new parts check from github (which appears to hang, with Fritzing listed as not responding) these files get corrupted. A reinstall does not modify them as they are user files that shouldn’t be changed in a code upgrade. Once the files are deleted and Fritzing is restarted you need to wait until the parts update check on github completes (which may take some time) to avoid this corruption.
There are two user directories (with your parts and the parts database) which don’t get touched during an install (to not affect your sketches during upgrades). On Windows they are in
c:\users\username\AppData\Fritzing\roaming\Fritzing (which is a hidden directory so you need to enable hidden directories in explorer) and
c:\Users\username\My Documents\Fritzing (where username is your windows id)
If you don’t have any parts or sketches you want to keep you can just delete those two directories and Fritzing will recreate them, or you can move them aside by renaming them if you wan to keep something in them.
Peter