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Stefan Kottwitz wrote:Which version of OS X is it? MacTeX support for older versions is limited. On my 4 years old Macbook, MacTeX needed tweaks to work well.

Stefan

High Sierra 10.13.2 on a mac book late 2011, 16gb ram
thank you and happy new year!

You could try "Reconfigure" in LyX first. Perhaps it did not find MacTeX or you need to install in the correct order: 1. MacTeX, 2. LyX. Or, if it was the other way round, reconfigure LyX.

Stefan

thank you but.. nothing to do.
I reinstalled both (MacTex first, then Lyx 2.3), tried reconfigure ...

Hi Marco,

welcome to the forum!

Sounds like you did the installation. Do you really want instructions and install it again? You could have a look here: https://wiki.lyx.org/Mac/Mac

Perhaps provide more information, such as error messages, or the .log file.

Stefan

thank you so much for your ...

Dears
I used Lyx a very long time ago for my phd thesis, and now, after many many years, I'd like to use it again
My idea was to install on my macbook, starting to create quite simple documents.
I downloaded and installed mactex and then latest Lyx.
But things seem not working properly, I can't ...