DBISAM 4.42 is now available for download. If you're an existing customer, then you should be receiving an email shortly with download instructions. You can view the release notes, including any breaking changes, on the download page before downloading.
This release includes support for RAD Studio 10 Seattle (Delphi 32/64-bit and C++Builder 32/64-bit). It also contains a single bug fix, which is detailed here.