You could download and install on your hdd and then copy/ paste the game directory onto your ssd, update shortcuts for the new location if you are sure you have the space for it. Clear up as much space on your main drive as you can, old windows files saved can add up quickly on smaller ssd's at around 20 gigs each release. Or you could add an additional ssd to your system just for programs depending on the motherboard and what connections you have available. (M.2, sata, or pcie slots)SSDs have gotten more affordable and larger capacity over the last few years.