Can you add the game Holy Knight Luviria or other Kagura Games

I have downloaded the file for Holy Knight Luviria, and have archived it, but it is still about 1.8 GB so it can not be uploaded. How were other games able to be uploaded when the download file is over 500 mb? I am genuinely confused on this matter as I do not know how to compress the file any further in order to upload it.