Before you hunt down the download, understand what you are getting. The 10.2.0.5 Patch Set (Patch 8202632 for Linux x86-64, for example) is not a full installer. It is a applied on top of a base 10.2.0.1 installation.
This version only runs on specific, obsolete hardware/OS combinations: oracle database 10g release 2 10205 download new exclusive
Oracle Database 10g Release 2 (10.2.0.5) is a significant update to the Oracle Database 10g family, providing improved performance, enhanced security, and simplified database management. This paper has covered the download process of Oracle Database 10g Release 2 (10.2.0.5) and highlighted its new exclusive features. By upgrading to Oracle Database 10g Release 2 (10.2.0.5), organizations can benefit from improved database performance, enhanced security, and simplified database management. Before you hunt down the download, understand what