ok in the terminal it works; any idea why it cant be don through app manager? is it that verification?

apt-get install qtmobiledemo-hyperui
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
libqt4-maemo5-core libqt4-maemo5-gui libqt4-maemo5-network
The following NEW packages will be installed:
libqt4-maemo5-core libqt4-maemo5-gui libqt4-maemo5-network
qtmobiledemo-hyperui
0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 8881kB of archives.
After this operation, 18,9MB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
libqt4-maemo5-core libqt4-maemo5-gui libqt4-maemo5-network
qtmobiledemo-hyperui
Install these packages without verification [y/N]? y