hi there,
we ran into serious problems after we tried to upgrade from Polylang 1.1 to 1.2 (or any future version of Polylang plugin including current 1.5.4).
Polylang 1.2 introduced major changes in the way it stores its data in database tables.
Although we tried to upgrade the plugin manually and upgraded to every each version from the past (1.1.1 -> 1.1.2 -> 1.1.3 -> 1.1.4 -> 1.1.5 -> 1.1.6 -> 1.2 -> ...), it seems to us that plugin doesn't have the ability to migrate its own data when upgrading to version 1.2 and later.
Is there any script or tool available that is able to migrate the plugin data from version 1.1.x format to 1.2 (and above) format?