Home Computer Access and Parental Control Lock My PC Upgrade to Lock My PC 4 The upgrade from Lock My PC 3.x to Lock My PC 4.x costs 9.99 USD for home users and 14.99 USD for business users. Request the upgrade online by filling this form. Your Name: Your E-mail: Your postal address: Your registration code for the old version of Lock My PC. Home user ($9.99 per a lincese) Business user ($14.99 per a license) Number of licenses to upgrade: Additional comment: *The upgrade fee is subject to change after Nov, 15.