Due to a problem in the Quartus® II software version 11.1 SP1, the MegaWizard™ Plug-In Manager cannot open Altera® PLL Reconfig v11.1 megafunctions for Stratix® V, Arria® V, and Cyclone® V devices.
To work around this problem, download and install device patch 1.dp2 or later for the Quartus II software version 11.1 SP1. Patch 1.dp2 is available from the related solution below, which also includes a pointer to the latest version of the device patch for the Quartus II software version 11.1 SP1.
This problem is scheduled to be fixed in a future release of the Quartus II software.