Sorry for the late response. Been a little busy.hmm, can you copy paste what's in your terminal?
My current guess is you typed the name of the file incorrectly
After you changed your directory, you can use the command "pwd" to check your current directory. The pathname should end in "LfA6.4.5/6.4.5.app/Contents/MacOS". If so, copy paste this command “chmod +x Lust\ for\ Adventure" and press enter. BTW, chmod +x or chmod 755 both works. It doesn't matter which one you use, you can keep using 755 if you want
Here's what's in my terminal:
Last login: Tue Mar 15 19:27:41 on ttys000
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.[My name]teki-MacBook-Air:6.4.5.app [Laptop username]$ cd /Users/[Laptop username]/Downloads/LfA6.4.5/6.4.5.app/Contents/MacOS
[My name]teki-MacBook-Air:MacOS [Laptop username]$ chmod 755 6.4.5.app/Contents/MacOS/'Lust for Adventure'
chmod: 6.4.5.app/Contents/MacOS/Lust for Adventure: No such file or directory
[My name]teki-MacBook-Air:MacOS [Laptop username]$
I need to change a little from the original for privacy.
Inside [] is what I change.
And thank you for helping me for this long. I really appreciate it. But it's fine if it doesn't turn out working.