Hi Ethan,
Indeed, I have not yet integrated the latest wave of PSID. This spring, we published CPF ver. 1.5, but PSID 2021 was not yet available during our work, so it’s not included. Unfortunately, I am not able to do it in the next months myself. It’s possible that the code will be updated by external users (please let us know if you have done it! or add modification through a branch in GitHub), so it can be added to the main CPF code. If not, I hope next year to get some funding to organize an update.
Best,
Konrad