If you're having issues with downloading Droid Transfer due to insufficient permissions, please try this direct download link...
It may also help if you change the download location. Try saving the file on your desktop instead of the default download folder. To do so, please right-click on the download link and choose the the Save As option, which lets you choose a different download location for your file.
If you get this error again, please cancel the download and try again using a different browser. It may also be helpful to run the browser in a new private or incognito window. This allows you to get rid of any redundant scripts that may be interfering with your download.
Another thing to try is to clear your cache and disable your extensions. Your browser extensions could be blocking the download.
Droid Transfer 2Transfer and manage your Android device media from your Windows PC.
Learn more Download