Is it permissible to use American software that prevents installation on devices of users from economically sanctioned countries or those on the blacklist, which sometimes include Salafists?

It is not permissible to download or copy programs except with the permission of their owners and according to their conditions. These programs are protected rights belonging to their owners, and the agreement mentioned in the programs is a contract between the user and their owners. The program owners have the right to prohibit their installation in any country or for any group.