How many pc can be installed with the groupy for business?
It depends on how many you purchase and what license type.
For 'single key' (default option):

You would receive 1 key - the quantity would dictate how many concurrent activations / PCs you could have activated at any given time.
For 'Multiple Keys', the quantity would dictate the number of individual keys that can only have 1 concurrent activation.
In general, Single Key is for individual corporate deployments; Multiple Keys are for resellers.
Sean Drohan
Stardock Support Manager