Run as Administrator as a context item is not available for .msi files for user accounts having Adminstrator rights, nor is it available to accounts even with the "hidden" elevated administrator rights (run Command Prompt (Admin) with
net user administrator /active:yes).
Offhand, the only way I know to enable it is via a registry edit (that is not to say there are not other ways nor that there is not a downloadable tool that does it; I'm just too lazy to look
.) That for Windows 10 and as far as I recall at least Win 7 and Win 8 too.
But to be frank, while I used to give myself the "hidden" elevated administrator privileges I have not done so since Windows 8 came out and I cannot recall since needing it.