Groupwise8 Client on SLED12

I am trying to install the Groupwise8 client and cannot get it installed on c.

SLED12 is running on 64 bit

Just trying to install the Groupwise8 client but cannot get it to run ./install
this is the error message I get:

Extracting files, please wait...tail: cannot open ‘+42’ for reading: No such file or directory

gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now
Done. Starting install.
sh: ./clientinst: No such file or directory


Need help!