Update: data.table 1.11.0 was accepted on CRAN 1st May 2018.
CRAN binaries should now start to update over the next few days.
Previous answer:
data.table 1.10.4-3 (Oct 2017) has been in error status for some months on CRAN which prevents the binaries being made available, very reasonably. We have fixed the problems in dev in good time months ago and just need to get the next release to CRAN. It is not a problem of CRAN or of R 3.5.0, per se.
In the meantime, could you use Windows.zip binary from dev? It is compiled for you and you don't need any tools. This dev version 1.10.5 is what will be renamed to 1.11.0 on CRAN. There is nothing in it that won't be in 1.11.0 so there is no addition risk, other than it not actually being on CRAN yet.
https://twitter.com/MattDowle/status/976890741543677952
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