ContributionsMost RecentMost LikesSolutionsRe: Can not download Quartus II 13.1 for Windows. Hi @pavlovconst Thank you for your reply. I have downloaded 13.0 sp1 in stead of 13.1. Then it works well. I will try an another browser later. Thanks and regards Can not download Quartus II 13.1 for Windows. Hi I can not download Quartus II 13.1 for Windows. I don't know why. I would like to use Cyclone III on DE0 board. Could someone let me know how to download it. Thanks and regards Solved