Expert needed in FlexLM (licence manager software)

Description

At Scientific Word Ltd we have been providing Tech Support since 1990 for Scientific Word and Scientific WorkPlace, software published by MacKichan Software (now out of business since 2021). The Scientific Word/WorkPlace network Floating licences use FlexLM, running on a Windows server, to manage a site's multi-user licensing.
The licensing works fine with FlexLM v11.16 (screenshot attached), but with FlexLM v11.18.3 we get the error message 'mackichn: Version of vendor daemon is too old'(screenshot attached). The file mackichn.exe is dated 1/7/09.
Since MacKichan Software is now closed for business there is no possibility that they will release a later version of mackichn.exe.Yet as time goes by, FlexLM v11.16 (which works for MacKichan Software’s programs) will eventually be deprecated, at which point our academic users at prestigious universities will be unwilling to continue using the older unsupported version 11.16 of FlexLM - but unable to use the newer versions.
Project:1. We need a workaround for the out of date issue ('Version of vendor daemon is too old') in order that Scientific Word/WorkPlace can continue to be licensed by later versions of FlexLM.2. Put another way, we need to get the 2009 vendor daemon mackichn.exe to work with FlexLM v11.18 and later.
Background information: the history of FlexLM is available at https://www.openlm.com/knowledge-base/flexera-flexlm-flexnet-publisher/ .We look forward to hearing from you. Thanks.