Cloud Imperium Games has confirmed on the Star Citizen forum that the client for the game is expected to be a 100 GB download.
The post, by director of game operations Jeremy Masker, said that the high client size is due to the size of the game and all the included assets for it. He also noted that patches will most likely be on the larger side as well.
“The size and number of assets that are left to deliver means that our client size is much more likely to be 100 GB,” Masker wrote, in part. “We are optimising game patching for speed and to only deliver diffs, but this is unlikely to reduce actual patch size. Again, each patch has 100s of assets, each of these assets are at times 200mb, this leads to 2-6 GB patches, and if we end up doing a file type re-factor and have to re-download 30-40 per cent of the assets on the hard-drive, then the patch will be 14-20 GB.”