older lyx file will not open

[Ivan Werning]

Hi

Help! I'm having trouble with an important older LyX file not opening in
LyX.

I'm a long time LyX user here. I am having trouble with an old file from
2014 that was created by LyX 2.1. I'm on a 2017 intel mac running OS 13.0.1
(Ventura).

When I try to open it in 2.3.6.2 I get filename.lyx  is from an older
version of LyX and the lyx2lyx script failed to convert it.

#LyX 2.1 created this file. For more info see http://www.lyx.org/
\lyxformat 474
\begin_document
\begin_header
\textclass article


I tried downloading earlier versions of Lyx to no avail. I completely
failed with 2.1.5.  Here when I run LyX I am asked to reconfigure. I do,
but I'm not sure it works.

The error messages I get are different:

The module basic has been requested by

this document but has not been found in the list of

available modules. If you recently installed it, you

probably need to reconfigure LyX.


Hit OK then...


The module theorems-ams has been requested by

this document but has not been found in the list of

available modules. If you recently installed it, you

probably need to reconfigure LyX.


The module natbib has been requested by

this document but has not been found in the list of

available modules. If you recently installed it, you

probably need to reconfigure LyX.


And it finally opens the file with a Parse error box complaining "Layout
`Proposition' was not found."


At this point I have the file fully open, but it will not compile. Nor do I
know what to do with it to take it to a newer version. I get no Export
options and I tried copy pasting into the newer LyX and that did not work
(I get again "[filname] is from an older version of LyX and the lyx2lyx
script failed to convert it.")


Any help would be much appreciated! Thanks.


-Ivan
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