Download PP 5.6 which supports your CPU architecture.  [URL]
I tried to install PP 5.7 sp3 on my Redhat linux but receive following error. Which latest PP version shall I choose?  package EMCpower.LINUX-5.7.3.00.00-029.el6.x86_64 is intended for a x86_64 architecture  # lscpu Architecture:          i686 CPU op-mode(s):        32-bit, 64-bit Byte Order:            Little Endian CPU(s):                4 On-line CPU(s) list:   0-3 Thread(s) per core:    2 Core(s) per socket:    1 CPU socket(s):         2 Vendor ID:             GenuineIntel CPU family:            15 Model:                 4 Stepping:              3 CPU MHz:               3200.000 BogoMIPS:              6400.16 L1d cache:             16K L2 cache:              2048K  # lsb_release -a LSB Version:    :core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch Distributor ID: RedHatEnterpriseServer Description:    Red Hat Enterprise Linux Server release 6.3 (Santiago) Release:        6.3 Codename:       Santiago
package EMCpower.LINUX-5.7.3.00.00-029.el6.x86_64 is intended for a x86_64 
architecture