This is what worked for me. First download the zip file from here
Open the Mac Terminal app ( Cmd+Space and enter Terminal )
cd where the zip file now exists:
cd ~/Downloads
Use unzip to get the contents of the zip file to the /Applications folder:
unzip IBMiAccessT_v1r1.zip -d "/Applications/IBM i Access Client Solutions.app"
cd to the following folder where acs_mac_app.zip now exists:
cd /Applications/IBM\ i\ Access\ Client\ Solutions.app/Mac_Application
Now unzip the acs_mac_app.zip file in / Applications, which will add the contents to /Applications/IBM i Access Client Solutions.app
unzip acs_mac_app.zip -d /Applications
You should now have "IBM i Access Client Solutions" with an icon in the / Applications folder, as shown below. Double-click to start or press Cmd + space to open Spotlight and type "ibm" to find it, as shown below.


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