Why can't I run the TortoiseSVN 64 MSI as Administrator, under Windows 7?

When right clicking on the开发者_JS百科 TortiseSVN MSI, why can't I see the option to "Run as Administrator"?

You don't need to right-click and "Run As Administrator" on MSI files. MSI files already declare internally whether they need admin rights or not, and windows installer will prompt for elevation as appropriate.