I was all excited about the migration to Windows 10 until I had to install Oracle client 126.96.36.199 on it. The Oracle client installation used to fail miserably at the last stage with this error named INS-20802.
As with several Oracle error messages, the details were hardly of any use and no clear understanding was possible even after examining the error log. Googling for the error led me to several forum posts but most of them didn't have the right solution - most answer seekers were meeting with dead ends.
I tried several methods for resolving the issue -
- Disabling Windows UAC
- Disabling firewall
- Disabling antivirus - mine was a fresh VM, so disabled Windows Defender
- Adding localhost IP i.e., 127.0.0.1 to the hosts file etc.
but none of them helped.
At last I found this which suggested installing Microsoft Visual C++ 2010 Redistributable Package (x86) and this solved the problem in a matter of seconds! I just had to click 'Retry' on the installation dialog.