You can find the Release Notes by clicking on the link.
Other features of the R 4 include:
Test update feature: Test your updates before you apply
Legislation Management change
Withholding Tax: New parameters to review if KIT=Yes
Flash Replacement (Stage 2)
MongoDB Alert: Upgrade to MongoDb 4.2 & instructions
Runtime hotfix
The patches and hotfixes for the 2020 R4 (12.0.24) can be downloaded from our support FTP site.