Every computer installed with ArcGIS Server needs an authorization file. There are a variety of registration methods for ArcGIS Server. My Esri can be accessed to get authorization files (via e-mail, fax, phone, or mail) and then continue to install. You can also register ArcGIS Server with the software authorization wizard that is started after the installation is completed (it is recommended that you use this method). But, no, this is the authorization file 10.5

Filename	Size	Update
Server10.5.ecp	5243	2017-11-09

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