Just got my license this evening
getting ready to install on XP machine

I read all the previous post I could find that was relevant
to license install

But, knowing how I mess up the most simple things I
want to take my time and try and do this right the first time
so that I won't be forever trying to figure what I did wrong

any advise on installing the license??

It says put the license file in the Mach 3 directory
just drag the file over into the Mach 3 directory
does that mean what it says...

I open up the Mach 3
directory and drag it in there with all the other files...

Is that it??

Yup. That's it.
You might also copy and paste a copy of it somewhere else on your pc (or thumb drive) for safe keeping ... just in case.
Russ