Can you share the alternative program of projector to show the patch file?

So do we get the source code to LaserControl, or just have to trust and not be able to modify this .exe?  Or have I glossed over something?

I haven't published the source code of the app because the programming decisions are strongly related to the Arduino code. By modifying the app, you won't be able to achieve new patterns, nor new functionality, without also editing the Arduino code. However if people are interested, I have no problem with sharing the code.

Arduino: 1.6.8 (Windows 10), Board: "Arduino/Genuino Uno"
WARNING: Spurious .github folder in 'Adafruit Motor Shield V2 Library' library
WARNING: Spurious .github folder in 'Adafruit Motor Shield V2 Library' library
WARNING: Spurious .github folder in 'Adafruit Motor Shield V2 Library' library
C:\Users\2-12\Desktop\laser\ArduinoLaserScanner-master\ArduinoLaserScanner\ArduinoLaserScanner.ino:16:26: fatal error: MultiStepper.h: No such file or directory
 #include
                          ^
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.
Invalid library found in C:\Program Files (x86)\Arduino\libraries\doc: C:\Program Files (x86)\Arduino\libraries\doc
Invalid library found in C:\Program Files (x86)\Arduino\libraries\examples: C:\Program Files (x86)\Arduino\libraries\examples
Invalid library found in C:\Program Files (x86)\Arduino\libraries\doc: C:\Program Files (x86)\Arduino\libraries\doc
Invalid library found in C:\Program Files (x86)\Arduino\libraries\examples: C:\Program Files (x86)\Arduino\libraries\examples
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

The problem is pretty self-explanatory. You are  missing the AccelStepper/MultiStepper.h library.

By the way, when you download a library, make sure to put in the the right folder structure, Documents\Arduino\libraries\xxx, where xxx will be the name of the library, and it will directly contain all the necessary files. It is always better to use the libraries folder located in Documents, in case of you will reinstall or update your Arduino IDE. You can always delete the .github folder to remove the warnings.

Unfortunately, the program LaserControl.exe is not working. Simply crashes immediately after the start.

Try to manually right-click the program, go to properties, and unblock the file. Also make sure to have .NET framework 4.5.2 installed.

If it still doesn't work, try using the LaserControl-old.exe that I have just uploaded.
Hope it will help.