Also having this issue.
I can still install 4.15.3 to the same drive,
but trying to install 4.23.1 gives the
“Maximum Path length exceeded … error code IS-PL01”
Obviously the path is D: drive letter, program files, epic… so the length of the file path is not actually the issue.
And given that 4.15.3 will install to it’s own directory along this same path, this is a bug in 4.23.1
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went to support: this error code is not even listed in their documentation.
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tried admin. Doesn’t make a difference.
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checked the logs.
SO.
It turns out that this has NOTHING to do with the file path that you choose.
This is a crash because the install file is trying to create this thing:
"
[2019.11.17-16.04.17:406][728]LogBuildPatchServices: Error: Could not create new file due to exceeding maximum path length D:/Program Files (x86)/Epic Games/UE_4.23/.egstore/bps/Install/Engine/Plugins/Developer/Concert/ConcertSync/ConcertSyncServer/Intermediate/Build/Win64/UnrealDisasterRecoveryService/Development/ConcertSyncServer/UnrealDisasterRecoveryService-ConcertSyncServer.lib
"
This isn’t a user chosen thing, but a bug in the Unreal installer.
It then immediately throws the error:
"
[2019.11.17-16.04.17:406][728]LogBuildPatchServices: Error: EBuildPatchInstallError::PathLengthExceeded PL01
"
This should be fixed immediately.
Who knows if it will be.
(I guess it’s possible there are other explanations, or other independent causes of the error… but check your logs after an install attempt and see if this matches your experience)