Installer completely inadequate

Program can not be installed according to the attached manual. By adhering to the statement, both old and new version will be installed side by side, the old version can not be removed subsequently. The "new" version can be installed and activated, after the required restart but message "invalid license" program is deactivated. Both versions do not initially uninstallable.
Then: One has the ongoing G-Data programs stop, start Program Manager, of 3 G-Data-processes a cancel (the other two can not be stopped). Then uninstall the "new" version possible of the old version can not access still possible at uninstallation attempt message "Setup (for deletion) requires at least Windows Vista SP1, Windows 7 just is not available in the current operating system.
And the "new" version on the installation CD is the September 2014 version, the old version, bought a year ago, being updated regularly, the program version of March 2015. So nothing installed on 2 computers, just entered the new access data. None, "invalid license"
So installed uninstall procedure as above, old "new" program, 50 minutes for updates on new version that has just been erased.
I call user-hostile programming.