Assembler vs Hex Editing

The many attempts of downloading programs that specialize in 6502 assembly only result in either its dos exclusive or it exits the instant I open the program.

DOS exclusive?!? You probably mean they are command line tools... You should learn how to use them and usually a single command will assemble your code. What is this trend that everything must have a GUI in order to "work" for the user...

Actually, one thing I did not mention is that I actually did try a few gui based programs as well that resulted in the same result of instantly exiting, and it hasn't been exclusive to programs related to hacking...