IBM released in the end of 2017 a „limited use“ version of 9.0.1 FP1.
IBM Doku: IBM Sametime 9.0.1 FP1 Limited Use release – December 2017

How to install this version, you will find a presentation from my admincamp session last year (sept. 2017)

In addition here is a short documentation how to ensure the „limited use“ license in a mixed IBM Sametime environment – IBM announced on the Think 2018 session this year, that the mobile support (via Sametime Proxy) ist planned to be added with the new Sametime version 10 until the end of the year