Thank you Rex Bouwense for your opinion, sorry for late.
Another moderator on this forum, seppalta, has developed and maintains a Linux LXDE Guide.
I'll surely take a look at the guide, and I'll contact him about this thread topic.
By the way are you required download both of the versions or does the second one completely replace the first.
Second version replaces first one at all.
Indeed, program doesn't need installation, so you could put "lxmenuman" script (and his libraries) in your path (say "/usr/local/bin"), or you can let it in its directory and launch it through xterm like so: "cd /path/to/lxmenuman && ./lxmenuman". Since my program doesn't have any dependency, it is intended to "simply work".
(P.S.: The only "dependecy" is the command "locate". ...But, wich system doesn't have such command so basic?)