I couldn't figure out how to install the X64 Offline Installer. It leads to a packed archive, which is easily unpacked. But what should I do then? If it was a .deb file (also a packed archive) instead of a tar.gz file it would be easy enough: use the QAptPackageInstaller or other similar software.
The recommended way to install Dropbox on Kubuntu is to download the deb from this page: https://www.dropbox.com/install-linux (That's what I do.)
To install this version of Dropbox specifically:
- Untar the installer, which will output `.dropbox-dist` in your current directory.
- Move `.dropbox-dist` to your home directory
- Start the Dropbox daemon by running `~/.dropbox-dist/dropbox`