Jim Burton schrieb:
I'm unable to open a file created in a 1.5.x version of Lyx in my older one (1.4.3).
You need to export your file in LyX 1.5.x as LyX-file in the format of LyX 1.4.x. The resulting file gets then the file extension ".lyx14" and this can you can open with LyX 1.4.x.
regards Uwe