Hello!
The errors related to zck files (Error while computing stat of compressed content of updateinfo.xml.zck) should be resolved in the latest builds (a yum update and installer run is all thats needed).
however the 2nd error ( OSError: File icons.tar.gz doesn’t exists or not a regular file) is strange and i’ve not seen it before today (although you are the 3rd user to report it). Here’s another case: Pulp3 Migration failed - #33 by jost