Don't copy files when installing local

[mousetail]

The change is very simple, It only effected like 4 lines. However, in the process, I had to upgrade the project to Visual Studio 2015, causing changes to a lot of files, like allmost every file. If any body else is not willing to upgrade, the only file I changed was FileDownloader.cs (At least, that is what it is called in my project, though I feel some files where randomly renamed). All other changes where either accidentally or side effects of upgrading the project. I suggest that instead of pulling this, you just copy the changed version of that file over. All I did was check if the url started with "File://" before downloading, and if it did, change downloadingTo to the location of the file on the disk. I tested it, and it seems to work.