How do you execute SilkRoadOnline?

the legislative branch

"Execution" means putting your signature on it, having it witnessed and having your signature, and the witnesses signatures notarized.  Your state laws will dictate how many witness signatures...

Executive Branch

You can only execute files that have the .exe or .msi (for some versions of windows) extension, simply right clicking, then selecting "open" or "Run" should work.

You may execute a will right up to the time of your death or until you become incompetent. It's better not to wait.