The following script helps manage multiple OpenShift oc client versions. It creates a symlink of the oc client of your choice to a location within $PATH location.
$ ./oc-switcher.sh
usage: ./oc-switcher.sh <new_version>
Currently running /my/oc/clients/openshift-oc-client-v3.10.0
Found the following oc-client versions in /my/oc/clients:
=> v4.2.11
=> v4.1.4
=> v4.1.0
=> v3.9.0
=> v3.7.1
=> v3.11.0
=> v3.10.0
$ ./oc-switcher.sh v3.10.0
Adding version v3.10.0
... done