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The eoPortal document Cupola Observation Module of the ISS found in @Dragongeek's answer to What are the two orange tabs stuck on opposite edges of each window of the ISS cupola? has some interesting items and references. One of them reads:

Hardware (secondary) - 2 Window Change Out Covers to support on orbit window assembly replacement

How do you replace an ISS window assembly on orbit?

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    $\begingroup$ The Cupola is probably a special case. You can close the CBM hatch behind it and allow it to vent to vacuum and then pressurize it when you are done. I doubt they ever want too! Also, probably has an inner window and outer window, both of which are sufficient in the short term to hold out the vacuum. I.e. Change the outer, inner protects. Change the inner, outer protects. $\endgroup$ – geoffc Nov 13 '18 at 16:09
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    $\begingroup$ Seems like they did it last year. Reading that, it seems it's just the outer sacrificial pane that they swap out once it gets too damaged. $\endgroup$ – Dan Mašek Nov 13 '18 at 17:17
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    $\begingroup$ @DanMašek per your link: "In the event of the damage being more serious, on-orbit replacement of an entire window is a design feature." it seems it isn't always just the outer pane. $\endgroup$ – uhoh Nov 14 '18 at 1:00

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