Have a different legacy version you need? (12.1, 4.0, 3.2)? Leave a comment below or check the Oracle Support Doc ID 2076107.1 for older release matrices.
: If possible, download v17.3.1 , as the initial 17.3 release contained a notable bug that prevented clicking within commented code. System Requirements for 17.3 download sql developer 17.3
sqldeveloper-17.3.0.270.2356-x64.zip (Windows) or similar. Have a different legacy version you need