As announced by PTC product management April 2015.

For the next major version of APP (version 11.1 in late July), PTC will be no longer be providing the ‘standard’  (pre Unicode based ISO version) version of APP. They will only be providing the Unicode version.

This is to allows the development to streamline some processes and to improve the efficiency of our development. It is expected that the vast majority of our users to be on the Unicode version for many years already.

For any users still using the standard version who are using converted PostScript fonts which are mapped to the old 3B2 character set. For these users with active maintenance PTC will provide an updated font conversion tool which will embed a Unicode ligature table rather than the old ISO one.