Drufazz
You don't need to download the package if doing a yum install from an external repo.
I see the package is in the repo specified.
Is the repo configured on your server, check with
db yum_repositories show smecontribs
which should give an output like this
smecontribs=repository
BaseURL=http://mirror.contribs.org/pub/smeserver/releases/7/smecontribs/$basearch
EnableGroups=yes
GPGCheck=yes
MirrorList=file:///etc/yum.repos.d/mirrors-smecontribs
Name=SME Server - contribs
Visible=no
status=disabled
Alternatively you can do a localinstall, as you have now downloaded the package
cd to the folder where the downloaded file is
eg
cd /tmp
yum localinstall smeserver-groupoffice*.rpm