Getting errors when trying to install an MSI package on your system? If you’re receiving errors like "The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2869" then try these two tricks:
1) Ensure no other instances of devenv.exe are running. That means use the Task Manager and kill any procs which might be running in hidden corners. Make sure to tick the box “Show processes from all users.”
2) Try running msiexec /i <YourMsiPackage> from a command line prompt as the admin.