Hi,
MasterCAM is made up of a series of modules, from basic mill modules through to five-axis HSM modules, each one you have to pay for.
Your imported model requires modules you don't have.
MasterCAM X8 is 10-15 years old, is it genuinely licensed? If so ask MasterCAM, they will surely sell you upgrades, but for X8 you'll probably have to buy new.
Craig