I increased to xmx6g doesnt work I have pretty much given up trying to use placeholder models. I successfully imported a rectangle though.
Sigh⌠what did I already say about setting the heap too big. It will be silently ignored and your heap will be back at 256m or whatever⌠too small for anything.
If the model wonât load with both heaps set to 1024m then you know you will never be able to load it.
But anyway, it sounds like all of the placeholders you picked are not really very good game assets anyway.
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If it is any value, the BlendSwap low poly models are usually great, never had a problem with them. Great placeholders. You can go far with them and as @Pesegato already mentioned, the simple geometries and JME bundled assets.
Blender can be pain to master 
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