I wrote a App for my family/friends and now we would like deploy it on or PCs. Publishing it in the store is not an option and not everyone has an Widows Live account. Sideloadi
The future is now! The process is easier on Windows 10 and the linked questions aren't relevant to that version. On Windows 10 users can enable developer mode or side loading in system settings on the "Update & security" page, in the for developers section.
See https://msdn.microsoft.com/en-us/library/windows/apps/dn706236.aspx