I have Visual Studio 2012 + Resharper 7.1.1000.900 + StyleCop 4.7.44 installed.
The problem is that no shortcuts
I got it working again by going into VS 2015 Options-> Keyboard, then hitting Reset. Then go back to resharper keyboard options and selecting the ReSharper scheme and hitting apply.
Updated Answer:
If the left corner shows it is a "Miscellaneous Files" on Visual Studio, you will want to make sure the current file is included in the project or not first, otherwise, ReSharper has no way to figure out the shortcut or even work. Visual Studio sometimes will not include the files in csproj
I have tried many of the above issues and still had installation problems.
It turns out that downloading the full version (not the web installer), and running it as administrator finally got the latest version installed with no errors in VS 2015.
For me the issue was in Resharper License. It has been delinked from my account for some reason and it said that the license is invalid. When I linked it again to my JetBrains account it started to work properly after a few minutes.