VGA Controller to Cyclone II

The PLL used in Cyclone IV is different to that used in Cyclone II - even though they are both, apparently, the same 'ALTPLL' primitive. Cyclone IV's PLL has more features, output clocks and options. It's possible that the PLL is using more features than are available to you in Cyclone II. However, whether it is or not, Quartus is likely to simply reject the design as it refers to a PLL it can't use in Cyclone II.

Assuming the design you're looking at doesn't use any of the Cyclone IV specific features, or too many output clocks, you can revisit each PLL in the design and regenerate it for Cyclone II.

Cheers,

Alex