I can't open the old version registered program in version 2021.2

I can't use the 2021.2 version because the programs made in the 2021.2 version of PCDMIS cannot be opened with the innovation that came in the 2021.2 version. I have a lot of prepared CMM programs. Translating them all into the new version will bring a lot of workloads. I don't know why such a feature was introduced, but there is no need to conclude a software maintenance agreement. What does the software team think.?