Fix RELEASES downloading from private repo

[anthrax63]

In the previous version, the RELEASES file was downloaded using the browser download url, which gives 404 for private repositories.

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[anthrax63]

Also i added ability to download any file from latest release. It is needed for Squirrel Windows to download nupkg file via proxy.

[tab1293]

@anthrax63 nice work!

I needed these changes in order to have a functioning auto updater for our Windows build. These changes should be merged to master!

[Deliaz]

Any updates?