Since version 2.5.0.1070 is no longer the current release, it is not hosted on the main official BlueStacks website . It must be sourced from reputable software archives:
: At least 2GB (though 4GB is recommended for better performance).
For most users, it is recommended to use the latest BlueStacks 5, which is significantly faster and uses up to 50% less RAM than previous generations. BlueStacks - Download for Windows - FileHorse