GT Auto Clicker is free software that helps you get rid of repetitive mouse-clicking work by automating the clicks at a specific time interval. It's also one of the best FPS unlockers that you can use in your favorite game such as Roblox, Minecraft, Cookie Clicker, Runescape, etc.
Key Features:-
* Simple and easy-to-use interface.
*Configurable click intervals.
* Support select single and double-click.
* Automate left, middle, & right mouse buttons.
* Real-time dynamic cursor location.
* Pick screen location with XY coordinates.
* Option to select unlimited clicks.
* Hotkeys to start and stop auto-clicking.
* Settings to save last fixed locations.
Website - http://gtautoclicker.com/
Download - http://gtautoclicker.com/download/
GT Auto Clicker - Free Auto Click
Re: GT Auto Clicker - Free Auto Click
Although I haven't tested it in any way, GT Auto Clicker claims portability -- but it's also supplied exclusively as a Windows App Bundle, so YMMV... Moving topic to "Discussion". 
Looking at the size of this auto clicking tool, it is highly portable. It’s easy to install and any new user can set the instructions easily.
- Portable & Easy to Setup
What is .Appx or .AppxBundle File?
.Appx or .AppxBundle is an application package that is widely used by Microsoft to provide apps securely to users. These file formats are easy to install and the best part, they get easily uninstalled without leaving any unnecessary registry files on your desktop. Furthermore, these are also known as “Universal Windows Platforms” apps & all the information such as name, permission, and description are saved in binaries. With these packages, the developer doesn’t have to create a separate installer file, and users can also download & install them easily.