ACUCOBOL runtime licensing availability on older versions


We have an in-house application running on ACUCOBOL 6.0 under Linux. We have licensing for 60 concurrent users currently. We would like to add runtime licenses for 10 more users, as we did in the past. Anyone here knows if this is still possible? Are licenses available for older versions of the runtime? We lost our previous sales rep from Micro Focus and the new one is telling us we are required to move to version 10, which we don't want to invest into.

thank you