Question Toshiba Satellite L555-S7008

You would need to contact the manufacturer to get the installation media. They may or may not charge for it.

Or, if just looking for Windows itself and nothing 'specific' you can try here... https://www.microsoft.com/en-us/software-download

NOTE: I would not ever suggest getting an installation disk from someone randomly picked online. You have no idea what kind of person it is nor what kind of damage the files they send you could cause. Better to be safe and use one of the options listed above than risk your device and possibly even your personal information.