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Quartus II Subscription EditionRelease date: February, 2013
Quartus II Subscription Edition v12.1 Service Pack 1
Please read before downloading. Important Critical Issue Notice for all
Quartus II software version 12.1 service pack 1 users.
Select a previous version of Quartus II:
You may be exposed to a vulnerability issue if you have installed or plan to install Quartus prime/Quartus II software from v11.0 to v18.0 to a location with space(s) in the path. See this KDB solution for more details.