-How do I upgrade my existing LyX system to version 2.0.x?
+How do I upgrade my existing LyX system to version 2.1.x?
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+* Upgrading from LyX 2.0.x:
+
+Python version >=2.4 is now required.
+
+Python version >3.0 is still not yet supported.
+
* Upgrading from LyX 1.6.x:
+The typeset of your documents with non-english language can slightly
+change in case of math environments and floats. LyX 2.0.x now has its
+own translation machinery for the strings that are not translated by
+babel.
+
The format of preference and session files has changed. LyX 2.0.x is
able to read old files but will save them in the new format.
When exporting back to 1.6.x format user-defined flex insets will not
be properly reverted. See RELEASE-NOTES for details.
+The UI layout named "classic.ui" and some localized keyboard bindings
+(sv, pt, fi) are not being shipped anymore.
+
* Upgrading from LyX 1.5.x:
The format of preference and session files has changed. LyX 1.6.x is