Many direct upgrade paths to Oracle 11g, 12c, or 19c require the source database to be at the highest available terminal patch set (10.2.0.5) before the upgrade utility can run safely.

: If you or your organization has a commercial license, you can search for and download legacy media from the Oracle Software Delivery Cloud.

If you need to discuss migrating away from 10g, I can provide information on upgrading to 19c or 23c. Download Oracle Database 10g (10.2.0.5)

The Oracle Database 10g Release 2 (10.2.0.5) has left a lasting impact on the database landscape. Many organizations still use this version, and it continues to serve as a reliable platform for critical applications. The lessons learned and innovations developed during the 10g Release 2 era have shaped the design and development of subsequent Oracle Database releases, including Oracle Database 11g and 12c.

If you must run 10.2.0.5, it should be completely isolated from the public internet. Place it behind strict firewalls and within a secure, dedicated VLAN.

Because 10g is an "older" release, it has been removed from the standard Oracle Technology Network (OTN) download pages

You generally must install the base 10.2.0.1 version first before applying the 10.2.0.5 patch. Media Requests:

For the base installation media (10.2.0.1), users typically visit the Oracle Software Delivery Cloud (formerly E-Delivery). However, please note that Oracle frequently retires older versions from public view, moving them to an "Archive" status that requires a formal request to support. Installation Prerequisites for 10.2.0.5

10.2.0.5’s Enterprise Manager requires or 1.5 . Modern JREs (8, 11, 17) will fail to load the console. You must run an old browser inside a VM (Firefox ESR 52 inside Windows XP or Solaris 10).

Are you setting up a or trying to recover an existing legacy database ?

Even though Oracle has moved on to newer, cloud-focused releases, 10g Release 2 (10.2.0.5) represents a high-water mark for application stability.

The most reliable and "exclusive" way to obtain the 10.2.0.5 patch set is through .