Error message when I try to upgrade netbackup 7.5.0.5 from 7.5.0.0

I am getting following error message when I try to upgrade netbackup 7.5.0.5 from 7.5.0.0

my OS is Suse linux 11.2 64Bit and download netbackup client 7.5.0.5 (three file and add each other as explain in doc)

error as follows

ERROR: Missing required server file in the /root/software/

VrtsNB_7.5.0.5.README

VrtsNB_7.5.0.5.postinstall

VrtsNB_7.5.0.5.postuninstall

VrtsNB_7.5.0.5.preinstall

VrtsNB_7.5.0.5.preuninstall

But I am sure these files are exits in the directory.

Please help to resole this

Thanks in advance

Manjula