You can determine the version of Antenna House that is integrated with your Compose function by examining a log file in the email notification following a compose job.
When a Compose job executes, the user who submitted the job receives an email notification with a .zip file attached that contains logs created by the job. Extract the log files and open the batch_####_out.log file. Search the file for the string AHFCmd : AH XSL Formatter. That line contains version information about the Antenna House formatter.
For example :
[exec] AHFCmd : AH XSL Formatter V6.4 R1 for Windows (x64) : 6.4.2.26942 (2016/12/07 15:30JST)