Well theres your problem youre using jpg. Gameguru uses .dds or .png
Also you will still have issues with that texture in gameguru because gg usrs only uv mapping and not geometry to apply textures, so just putting a whole texture in like that will leave you with seams on your model, modelling programmes apply materials using a mixture of uv and geometry, so it may look fine but can have visible seams in gg, thats why you need to bake a texture from the material and not just use tge materials texture directly.
[img]belidos3d.swgrp.co.uk/wp-content/uploads/2016/03/blogo.png[/img]
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