When you click the Internet Explorer extension link you'll get this dialog:
Click the Run button. Then you'll see this warning.
Again, click the Run button. That's all that's required. There is no Digital certificate because they are expensive and so not an option for free software. Of course you could also download the installer to your desktop and run it by double-clicking it there.
For the extension to work. you'll need to re-start Internet Explorer. You can do this any time but the LaterMaybe extension won't be available until the next start-up.
You can remove the LaterMaybe extension any time the usual way:
Start menu > Settings > Control Panel > Add or Remove programs.
As a browser extension, this tool is very minimal. All it does is register an extra item - "LaterMaybe" - to be added to IE's context (right-click) menu . When this is selected it executes a Javascript call to open a window at latermaybe.com, passing as paramers the link you clicked, along with its description, or the actual page and title if you clicked a blank area of the page. The installer simply puts the HTML file containing the Javascript into your Program Files folder under LaterMaybe, and adds a registry entry to Internet Explorer's "MenuExt" section.