Is PSIM v2021a compatible with the previous versions?
PSIM v2021a is backward compatible. That is, version 2020a can read the previous version files. But previous versions (v6 to v12 and v2020) can not read version 2021a files. Version 2021a has the option to save files in versions 2020, 12, 11.1, 11.0, 10, and 9.3 format.