EEM 12.51 CR05 server is 64bit-only, but backward compatible with 12.51 pre-CR05 32bit/64bit SDK.
On UNIX/Linux EEM 12.51 CR05 server upgrade (through CA Common Components 11.3.6 SP6) is seamless. On Windows, one should remove the 32bit EEM first (of course backing up their applications and policies) and install EEM 12.51 CR05.
As for the "Protected multilib versions: libuuid-2.23.2-33.el7_3.2.i686 != libuuid-2.23.2-26.el7.x86_64" , try this first, please:
# yum update libuuid
(This updates your existing 64bit libuuid to libuuid-2.23.2-33.el7_3.2)
# yum install libuuid*.i686
(This will install the 32bit libuuid)
Thank you,
Chandru