There are different ways to obtain ASPECT that we describe in the manual.
You can download the latest release here.
After downloading, unpack the file. Then follow the installation instructions linked to above.
Current development versions
In order to download the current ASPECT development sources, use the following command:
Then again follow the installation instructions linked to above.
git clone https://github.com/geodynamics/aspect.git
Experimental VirtualBox Image
Alternatively, we are providing an experimental image for a fully configured version of ASPECT. For this, you will need to install VirtualBox on your machine, and then import a virtual machine image that can be downloaded from here. Note, however, that the machine image is several gigabytes in size and downloading will take a while.