Grammar Checking -- noob help!

[Dan]

I'm writing what is essentially going to be a small text in Physics with a
lot of high end Mathematics, so a good Science grammar checker would be a
nice idea.  I found the LyX wiki and the lyx-cg system.  Are there other
options?  I'm also looking at Grammarly but I'm not sure it can handle the
kind of language help I might need.

Let's say I go with the lyx-cg idea.  (Which is why I'm posting this here.
:) )  I have a few questions.
1)  Is lyx-cg up to date?  I'm noticing that the Github files are as much
as 8 years old.

2)  If I have to buy something I'd prefer to buy it outright.  langaugetool
charges per month.  Is there any way around this?

3)  But the main problem is the actual lyx-cg file.  I have it on Github,
but what do I do with it?  I was expecting to download a file and extract
it.   But it's giving me a list of files with their codes, not something I
can download?

Sorry, I'm a bit of a noob.  I could use a hand.

Thanks!
-Dan
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