PRO - promo price?

I received an email today that if I upgrade to PRO, I will get a discount to 13.95€. I am thinking of installing emclient to all computers in my company (8 seats). My question - is this promo price valid for only one PRO license or for all licenses which I will purchase? What will be the total price if I purchase 8 PRO licenses? And with lifetime upgrades for all?
Also, does the PRO license ever expire and has to be renewed?

Hello, the calculator on our pricing page should provide you with precise calculations for multiple licenses, including lifetime, but the promo offer is valid for all of the licenses, no matter how many you want to buy. Also, PRO licenses never expire. Hope that helps.