Not sure about versions earlier but 5.3 source on git has it and 4.26 from Launcher has it and so does 4.27. But 5.2 and 5.3 from Epic Launcher is missing it. I came across the issue when I tried to run an iOS build from 5.3 and it crashed on launch due to missing data folder for ICU.
So I went to try the 5.3 source on my Mac and it fails to launch although does compile fine. When launching the UE5 Editor for Mac it fails on line 162 inside ICUInternationalziation with the check of the ICUStatus failing “Failed to open ICUInternationalization data file, missing or corrupt?”
I have the same error in my packaged dedicated game server (UE 5.3). Any updates?
“Failed to open ICUInternationalization data file, missing or corrupt?”
FWIW, this happens for me too, when pulling from github release branch and building on MacOS.
I wonder if it’s a working directory problem, or actual missing data?
Hi!
I don’t know if it’s the right place to give an answer, but I hope it will help somebody 
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I had a crash when I tried to open the project with the same log: “Failed to open ICUInternationalization data file, missing or corrupt?”.
It was on macOS with 5.4 and 5.5. I checked the code around line 162 of ICUInternationalization.cpp (on 5.5) and from what I understood, it tries to check if there are any Internationalization content in the Project we’re trying to open (Content/Internationalization) + in the Engine.
My solution
I had an empty Internationalization folder in my project. By removing it, the project could launch without any crash.
Hi! Just to understand… Did you just deleted all the content in Content/Internationalization to solve the problem?