I have checked in Download Appworld, confirmed :Singapore has free apps from BB Appworld available.
Again, I tried via PC, but when I clicked download with my BB connected to PC, the same error appears.
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axError.gif
Sorry, your device does not meet the system requirements that are needed to support BlackBerry App World.
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I have read a few threads about hitting this error, seems no solution of it.
I think Curve 8520 does not support App World.
Geez.