AIX: Can not install software

AIX:  Can not install software

I have the following software

# ls /home/mq_inst/WS_MQ_FOR_AIX_V8.0_EIMAGE.tar.Z
/home/mq_inst/WS_MQ_FOR_AIX_V8.0_EIMAGE.tar.Z

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I go to the following smit screen

                                Install Software

Type or select a value for the entry field.
Press Enter AFTER making all desired changes.

                                                        [Entry Fields]
* INPUT device / directory for software              []                      +

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I enter the directory as follows:

                                Install Software

Type or select values in entry fields.
Press Enter AFTER making all desired changes.

[TOP]                                                   [Entry Fields]
* INPUT device / directory for software               /home/mq_inst
* SOFTWARE to install                                [_all_latest]           +
  PREVIEW only? (install operation will NOT occur)    no                     +
  COMMIT software updates?                            yes                    +
  SAVE replaced files?                                no                     +
  AUTOMATICALLY install requisite software?           yes                    +
  EXTEND file systems if space needed?                yes                    +
  OVERWRITE same or newer versions?                   no                     +
  VERIFY install and check file sizes?                no                     +
  Include corresponding LANGUAGE filesets?            yes                    +
  DETAILED output?                                    no                     +
  Process multiple volumes?                           yes                    +
  ACCEPT new license agreements?                      yes                    +

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I hit enter twice

I get the following

                                 COMMAND STATUS

Command: failed        stdout: yes           stderr: no

Before command completion, additional instructions may appear below.

0503-003 geninstall:  The specified device /home/mq_inst
        is not a valid device or file.
#---------------------------------------------------------------------
# No installable software products were found on the media.
#---------------------------------------------------------------------

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I tried the same thing, but entered the following: wehn asked for the device or directory.

/home/mq_inst/WS_MQ_FOR_AIX_V8.0_EIMAGE.tar.Z

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... but I get the same error

how can I fix this

Is there an alternative procedure to do this with installp ?

Thanks