using the application manager - application fails to install

using apt-get install gizmo-project returns the following:

/home/user # apt-get install gizmo-project
Reading package lists... Done
Building dependency tree... Done
The following NEW packages will be installed:
gizmo-project
0 upgraded, 1 newly installed, 0 to remove and 8 not upgraded.
Need to get 4227kB of archives.
After unpacking 10.9MB of additional disk space will be used.WARNING:
The following packages cannot be authenticated!
gizmo-project
Install these packages without verification [y/N]? y
Get:1 http://packages.gizmoproject.com chinook/user gizmo-project
4.0.0.94 [4227kB]
Fetched 4227kB in 26s (158kB/s)
(Reading database ... 18187 files and directories currently installed.)
Unpacking gizmo-project (from .../gizmo-project_4.0.0.94_armel.deb) ...
dpkg: error processing
/var/cache/apt/archives/gizmo-project_4.0.0.94_armel.deb (--unpack):
trying to overwrite
`/usr/share/icons/hicolor/scalable/hildon/gizmo-project.png', which is
also in package gizmo-installer
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/gizmo-project_4.0.0.94_armel.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
/home/user #

is it my machine, me or gizmo
if gizmo who do i report the bug to