Thanks for the shout-out lostclimate

@ratchet: Don't take this the wrong way, and I don't know if you already know this, but since your English isn't very good it is often difficult to understand what you are saying, or (sometimes more importantly) the way you are saying it.
It often comes across very rudely. Not just in this thread, but in other threads. Please take this as constructive criticism

The topic in this thread is not how you feel about lostclimate's model, it's the normalmapping.
I stumbled across what I thought could've been the reason Blender normalmaps weren't showing up properly in A7, and lostclimate wrote and tested and confirmed the solution, updated the wiki with a new version, and announced it here for anyone who's had the same issue (and rewarded me generously for something that didn't take any effort on my part

).
If you want to just edit the image in GIMP and use the same shader as you used to, no dramas:
Go to Colors->Levels, change the Channel to Blue, and move the left-most arrow in "Output Levels" up to "128", then hit "OK".
But why change the normal maps of all the models you made in Blender, when you can just make one change to the shader and forget about it?
Well ...
You should tell ot Blender forums for normal map not done like in others modelers !
We don't know if it's specific to Blender. It's just two different ways to do it. One is potentially more accurate in the Z-axis (Blender's, though I don't think accuracy has ever been an issue), while the other is more straight-forward (I don't know which one is more standard).
If you use a different normalmap-creator, you should find out if the Z-axis is encoded the same way as the other axes to determine which shader you'll use.
Jibb