Blueprints modified in 4.15 becomes unusable in 4.14

Development Programming & Scripting Blueprint
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1

We are developing open source Unreal plugin and we wish to support 4.14 as well as 4.15 users. Our plugin project upgrade from 4.14 to 4.15 went fine with few hassles however major issue came when we realized that any BPs that gets modified in 4.15 became invisible in 4.14. I believe these modified BP don’t get even loaded properly when you press Play button.

My hope was that uassets BP files in plugin would remain compatible between 4.14 and 4.15 so users (who are developers) don’t have to move to new engine version en-mass.

Is this bug/known issue? Can it be fixed?

2

Hey sytelus,

The engine is not compatible in that way. You won’t be able to use 4.15 in 4.14, or earlier. You can however use older versions in newer versions, such as 4.14 in 4.15.

This is not a bug and is intended. It’s best for your project to choose a engine version and stick to it. If you change to newer versions, you won’t be able to go back.