I don not think it is possible
there seems to be too much different
maybe you can call xilinx or visit www.xilinx.com to get a resolution

Can anyone tell me if it is possible to update from Xilinx EDK 6.1.xx to EDK
6.3.xx.

It appears that I need to buy a new copy of the EDK to be able to update
from EDK 6.1

Linas