oldie/newbie convert/fresco question

[jh]

A while back David K kept on trying to get me to update beyond 2.18.2 
even though I said I'd failed a number of times and that many of the 
changes between these versions seem opaque to me.

My main text editor has developed a major crash where it freezes 
everything and the creator is unable to fix it.
I have rarely used Frescobaldi because generally everything has worked 
but when stymied it has helped in the past to find my mistake.
So I decided to default to it.  Noticed that it has a convert ly tool 
tried it.
This machine is generally not online; the convert tool ran for 4 hours 
and nothing changed.  I gave in and went online and the tool does work.

1] it seems that this will not work if unconnected to the internet.  My 
notation win10 is not connected for various reasons and just as I have 
had issues with updating versions to lily I have even connected to the 
internet am unable to update win10 which is fine- sort of.
but
2] if convert ly requires internet connection I'm kind of stuck because 
win10 did not allow (or didn't tell me how to have two versions of lily 
on my machine.  So I downloaded the current version uninstalled 2.18 and 
installed the current version 22.something.
so
Must I be online in order to access my thousand of pieces (my 
compositions) written in everything from 1.? and 2.18? to get this to 
work or is there more than another way?

I'm kind of hoping this is the right place to ask this as it is 
connected to Frescobaldi but seems to me to be a lily question.

Thanks
Jay
--
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I am looking for 2-3 dancers various abilities/disciplines for a piece
Called The Box it was scheduled for November  but we know how that has
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