First open Terminal and visit your Downloads folder by typing:
Next you need to depackage(extract) the installed deb files using
dpkg as below:
sudo dpkg -i <your-.deb-package-name.deb>
Example: For your installation type
sudo dpkg -i google-chrome-stable_current_amd64.deb
Repeat for all .deb files.
Right click the .deb file and select Open with > Software Center