The architecture or bitness (32/64) of the bundled JVM might not match your machine

I know I am using a 64 bit AIX version however when I try to install 64 or 32 bit version of Soapui 5.1.3 I get The architecture or bitness (32/64) of the bundled JVM might not match your machine. Any idea how I can install Soapui on AIX?

bash-4.2$ getconf KERNEL_BITMODE
64
bash-4.2$ getconf HARDWARE_BITMODE
64

bash-4.2$ ./SoapUI-x64-5.1.3.sh
Unpacking JRE ...
Preparing JRE ...
./SoapUI-x64-5.1.3.sh: bin/unpack200: 0403-006 Execute permission denied.
Error unpacking jar files. The architecture or bitness (32/64)
of the bundled JVM might not match your machine.

bash-4.2$ ./SoapUI-x32-5.1.3.sh
Unpacking JRE ...
Preparing JRE ...
./SoapUI-x32-5.1.3.sh: bin/unpack200: 0403-006 Execute permission denied.
Error unpacking jar files. The architecture or bitness (32/64)
of the bundled JVM might not match your machine.