UPOS1162 — Bad version number used in header

UPOS version 1.16.1 seems to add and extend UPOS 1.15, not 1.16. UPOS 1.16 does not exist.
However, should I be wrong and UPOS version 1.16 does exist, the specification is not on your web site (History consists of specifications UPOS 1.15 and UPOS 1.16.1 only).
In addition, in both 1.16.1 specifications (normative and informative document), no bookmarks are present, making it hard to work with both of them.