All versions of fresh installation drives made using Apple authorized "create media installer" software made by a former Apple Tech. All versions from 10.4 (Lion) to the most current (Sequoia) and all in between.
These can be used to update, reinstall, reinitialize or just refresh your operating systems. If you have an older Mac with a flashing question mark folder when it starts up, it could be a corrupted operating system and this can help. (Also could be a dead drive but I can help you determine that).
These are custom made based on your needs so when you email let me know what version you want. Also if your operating system is "maxed out" and no longer supported by Apple, depending on your system, there maybe a way to allow you to use a newer OS.