If you must use the 2015 version, these steps may help, though they are not guaranteed:
Q: Is CodeSoft 2015 compatible with Windows 11? A: While CodeSoft 2015 was not officially designed for Windows 11, many users have reported that it works with some minor tweaks. Codesoft 2015 Windows 11
Input the following command path (adjust the directory name if a custom path was used during installation): If you must use the 2015 version, these