I got a comment on an installation post asking where to find Essbase Server and Client 11.1.1. I went to eDelivery and took a look and, sure enough, it looks like it appears the 11.1.1.0.0 Essbase builds are no longer available. The 11.1.1.1.0 builds are, however, available.
I don't know exactly what the standard procedure is for Oracle for availability of older builds, but it seems somewhat consistent with what Oracle did by removing older versions of the software right after they acquired Hyperion (which used to leave many, many versions available for download.
My advice is to download all of the available files in a specific version and archive it on your own local machines in case you need them in the future. We do exactly that at our company and have stored away all the versions (and their supporting files) that we support with our Dodeca product in the future.
Note: Please do not send me email or comment on this blog asking if I can send you x.y.z version. Those emails/comments will absolutely and unequivocally ignored due to potential legal ramifications.