New Client Install
I was using a batch file initially but when it errored out I tried just manually running the MSI and it gives the same results. The 1603 for MSI’s is a generic can’t install error. You can also get that if windows is waiting for a restart after updates is a common cause also.
Further information specific to msi’s and error code 1603.
How are you trying to install the client, exactly? I see the 1603 on Java because of its inability to install through the SYSTEM account. This only occurs, to my knowledge, if done through snapins.