GCBASIC 0.9.3.0 is not yet released. It is almost ready to go - I'm just checking over it for bugs, and waiting for a couple of translations. If you really want it now you can install http://gcbasic.sourceforge.net/newfiles/update.zip, but I'd recommend waiting a few more days and downloading it when it is released.
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I recently saw in the #mem directive help a comment about GCBASIC ver. 9.3.0. My question is, where I can dowload this version?
GCBASIC 0.9.3.0 is not yet released. It is almost ready to go - I'm just checking over it for bugs, and waiting for a couple of translations. If you really want it now you can install http://gcbasic.sourceforge.net/newfiles/update.zip, but I'd recommend waiting a few more days and downloading it when it is released.