Hello all,

The ensembl 91 gtf (converted to GRanges on the fly) and fasta (twobit files) been added to AnnotationHub and are currently available in Bioc 3.6 (release) and Bioc3.7 (development)

Bioconductor version 3.6 (BiocInstaller 1.28.0), ?biocLite for help
> library(AnnotationHub)
> hub = AnnotationHub()
snapshotDate(): 2017-10-27
> length(query(hub, c("ensembl", "gtf", "release-91")))
[1] 279
> length(query(hub, c("fasta", "release-91", "twobit")))
[1] 462



Bioconductor version 3.7 (BiocInstaller 1.29.2), ?biocLite for help
> library(AnnotationHub)
> hub = AnnotationHub()
snapshotDate(): 2017-12-20
> length(query(hub, c("ensembl", "gtf", "release-91")))
[1] 279
> length(query(hub, c("fasta", "release-91", "twobit")))
[1] 462

Thank you