If you possess an .exe file, or any file for that matter, whether you've created it or not, and you desire to generate an installation for it, the process is straightforward and rapid, although the tutorial is meticulously detailed. Please note that this method is exclusively for Windows users.
Steps

Employ the Windows Key+R keyboard command and input 'iexpress.exe' into the Run box. Alternatively, you can access the Run app by typing 'Run' into the search bar.

Expect a wizard menu to appear. If you possess a .SED file, opt for 'Open existing SED'. However, assuming this is your initial encounter with this process, select the top option, then proceed by clicking 'Next'.
On the second menu, you must select the action to be taken upon completion of the installation process.



Choose a title for your installation. This will serve as the filename for the installation and will also be displayed on the Title Bar (the bar above the program). Then, click on 'Next'.
Now select the prompt.




Now select the files you wish to install. Click 'Add' to include a file. If you wish to remove a previously uploaded file, simply click on it to highlight it and then click on 'Remove'. Once you are done, click on 'Next'.
Now select the size of the installation window.




Now you have the option to choose a concluding message to wrap up the process. These messages appear after the installation is complete, such as 'Thank you!', 'Installation Completed, You may exit', or even 'Visit my website!'.

Now choose where the installation file itself will be located. This is where the final product will be saved on your computer, either to share with others or to upload. Click 'Next' and proceed through the final notes.

A CMD window will appear - do not close it! This window is responsible for loading the files for the installation and creating the wizard.
Tips
If you're utilizing this method to install software that you've developed yourself, it's advisable to have a license to prevent others from copying it. You can create one using Notepad, and then insert it when prompted in the wizard.
Warnings
The installation file may not function properly or crash on older computers. Additionally, please note that this method is not compatible with Mac and Linux systems. Avoid including too many files or very large files (such as a 1GB game) for installation, as it may cause the installation wizard to crash, as well as the installation itself.