Hi Sony,
Download the new pwr55_5.5.0-1.2_amd64.deb package instead, and the easiest is to download it from Ubuntu because it can be a bit tricky to find the file otherwise.
Open a terminal window, go to the download directory and install the package
> cd Downloads
> sudo dpkg -i pwr55_5.5.0-1.2_amd64.deb
This might give some dependency error messages, but the next command will hopefully fix that and finish the installation.
> sudo apt-get install -f
Logout the current user and login as user pwrp (pwrp) instead.
Double click on the Proview icon and follow the Getting Started Guide to create a project.
/Claes