This issue impacts the 5.4.0.0 and 5.4.0.2 versions of the client as well...

And our users do find the message confusing, given that we insist on
10.4.7, based on the documentation provided by IBM...

Heinz Flemming wrote:

According to Gretchen L. Thiele:

Checking to see if anyone else has this problem with TSM v5.4.1.0
for an Intel Mac...

I just upgraded a Mac to 10.4.10, but the TSM client installation is
failing, stating that I must be at OS X 10.4.3 or higher.  I don't think
the installer is parsing the trailing '10' correctly...

  There is an programming error in the installation script regarding the check
  of the os-level which must be greater '10.4.3'.
  The value '10.4.3' is the second error, must be '10.4.7'.