No available devices !! Where have they all gone ???

It depends on what and how you are installing:

1.- For the Web Edition, you only use a single EXE/SH file to install everything.

2.- For the SP1 Installation (Subscription Edition), you need to have V11.1 installed first. But assuming you do, the Service Pack install is also all incluside in a single file.

To install V11.1, you can use one of the following options:

1.- Using the Altera Installer, you will be able to select the device families you want, and then the installer will download and install only those families.

2.- Using the four files described by Socrates (not that you only need to install the device file that you need. For example, if you only need Cyclone or Max, you can install the 11.1_173_quartus_windows.exe and 11.1_173_devices_cyclone_max_legacy_windows.exe)

3.- You can download the ISO (which is the DVD image). You can use open source utilities to mount as a DVD drive, or you can burn a DVD.

Mafra, please describe which method you are using so we can better help you.