[Framers] No thesaurus found in FM-15

[Klaus Daube]

Dear all,

In FM-15 (2019) I wanted to use the thesaurus (Edit > Thesaurus) while a word in a  
pargraph with language English (UK) is selected. But I get the message
  A English (UK) Thesaurus is not available.

The langugae of the paragraph does not matter to get the very same message...

I looked into the location for dictionaries 
C:\Program Files\Common Files\Adobe\Linguistics\5.0\Providers\Proximity\11.00\ and 
there are thesauri for BR and US: brt55.ths, usa03.ths and all the other supported 
languages.

Why does FM not find the UK thesaurus - and why is this message independent of the 
paragraph language?~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Klaus Daube             Phone:  +41-44-381 37 77
Schäracher 11           Mail:   klaus at daube.ch
CH-8053 Zürich          Web:    www.daube.ch