Add a plugin (or standard feature) to import from MyGeneration 1.2 if it exists either in the installer or from the app.
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unfortunately the architecture of MyGeneration-s MyMeta.dll does not allow this :-(
however there are thoughts to make MyGeneration 1.4 more robust so that MyGeneration 1.5 might load Plugins for from MyGeneration1.4. via DdlDom.dll
Since MyGeneration 1.3Betta7 you can Install MyGeneration1.2 separately form MYGeneration1.3 so you can use both.