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Please see the official X‑Plane Support page for help.
I am not with Laminar Research; just a flight simmer.
Just like X-Plane version 10 you have to insert disc 1 of version 11 to run the software. I am in that same situation. However with XP10 there was a USB dongle (key) available at extra cost that allowed XP10 to be run and preserved the integrity of and replaced the disc.
Unfortunately there is no such alternative for XP11. However, it has been suggested to me that an ISO disc or dongle could be created as the replacement for disc 1. As my system is currently mothballed I have not been able to experiment with this suggestion. A link I found can be discovered at https://www.lifewire.com/how-to-burn-an-iso-file-to-a-usb-drive-2619270
Hope it works and good luck.
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