In this case you need to update every ip core version in the tcl scripts, and these errors will disappear.
I would suggest the following, after the error appears, type the following command into the tcl console:
join [get_ipdefs] \n
This will list all the IP cores, from all repositories, with there core version number.
Knowing these information you just simply need to change every version numbers in the files ./hdl/projects/fmcomms2/common/fmcomms2_bd.tcl and ./hdl/projects/common/zed/zed_system_bd.tcl.
An IP core instantiation looks like the example bellow:
set sys_ps7 [create_bd_cell -type ip -vlnv xilinx.com:ip:processing_system7:5.3 sys_ps7]
But please keep in mind, that in the moment when you made this downgrade, we can no longer support you.
Thanks,
Istvan