I recently had (non unreal related) issues with dual Visual Studio installs, having both 15 pro and 15 community. I decided to scrap 15 community, but doing so partially uninstalled UE4 and the launcher. I had to redownload and reinstall the launcher and repair the engine, which got the editor back up in running, but I can no longer package projects for Windows x64.
Since then, I have scrapped VS15 Pro and reinstalled VS15 Community from scratch, but UE4 still can’t package. For reference, I have the common tools for C++ installed, and my windows system environment variable ‘VS140COMNTOOLS’ pointing to the correct directory.
For the purposes of testing, I created a fresh project in 4.14.3. Packaging fails pretty much instantly. Attached is the output log.