Before I move to 8.x, I am trying to set the currently operations ZCS in a VM
Downloaded the right tgz ( zcs-7.2.2_GA_2852.RHEL6_64.20121204211835), unpacked, and running the install script:

Code:
[root@ems-dr zcs-7.2.2_GA_2852.RHEL6_64.20121204211835]# ./install.sh
bin/get_plat_tag.sh: line 208: dpkg: command not found

Operations logged to /tmp/install.log.2010
Checking for existing installation...
    zimbra-ldap...NOT FOUND
    zimbra-logger...NOT FOUND
    zimbra-mta...NOT FOUND
    zimbra-snmp...NOT FOUND
    zimbra-store...NOT FOUND
    zimbra-apache...NOT FOUND
    zimbra-spell...NOT FOUND
    zimbra-convertd...NOT FOUND
    zimbra-memcached...NOT FOUND
    zimbra-proxy...NOT FOUND
    zimbra-archiving...NOT FOUND
    zimbra-cluster...NOT FOUND
    zimbra-core...NOT FOUND
./util/utilfunc.sh: line 696: dpkg: command not found


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ZIMBRA, INC. ("ZIMBRA") WILL ONLY LICENSE THIS SOFTWARE TO YOU IF YOU
FIRST ACCEPT THE TERMS OF THIS AGREEMENT. BY DOWNLOADING OR INSTALLING
THE SOFTWARE, OR USING THE PRODUCT, YOU ARE CONSENTING TO BE BOUND BY
THIS AGREEMENT. IF YOU DO NOT AGREE TO ALL OF THE TERMS OF THIS
AGREEMENT, THEN DO NOT DOWNLOAD, INSTALL OR USE THE PRODUCT.

License Terms for the Zimbra Collaboration Suite:
  http://www.zimbra.com/license/zimbra_public_eula_2.1.html



Do you agree with the terms of the software license agreement? [N] Y

Checking for prerequisites...
     FOUND: NPTL
     MISSING: sudo
     MISSING: libidn11
     MISSING: libgmp3c2
     MISSING: libstdc++6
Checking for suggested prerequisites...

###ERROR###

One or more prerequisite packages are missing.
Please install them before running this installer.

Installation cancelled.
Any ideas are welcome, what especially worries me is the dpkg error - afaik the installer checks for installed packages using rpm/dpkg, depending on the distro in use, and dpkg shouldn't be used on an RPM distro like Scientific, especially since I'm using a "RHEL" installation package