ContributionsMost RecentMost LikesSolutionsRe: Why Nios II cant open Hi @BoonBengT_Altera, sorry for late reply, I downgrade my Quartus Prime from version 20 to version 18, now the Nios II is working well. Thank you. Why Nios II cant open Why Nios II Software Build Tools for Eclipse (Quartus Prime Lite 20.1) can not open? Only can open once after download, after that had no response. I had tried to re-install and also download but still the same.