You may have noticed that using the the installation instructions, you unzip the library on a directory but when you try to load them you will end with a Developer cannot be verified or something other similar message fron osx.

The problem is that the code is not signed by Oracle and osx marks it with a com.apple.quarantine. You can see the at sign at the end of the file anmes doing a

> ls -l
-r-xr-xr-x@ 1 staff       5780 Feb 22  2019 BASIC_LICENSE
com.apple.quarantine        57
-rw-r--r--@ 1 staff       1670 Aug 19 05:57 BASIC_README


The solution is to give exucution permissions to all files and then remove the extra @ attribute.

cd instantclient_19_3
chmod u+x *
cd ..
xattr -r -d -s com.apple.quarantine instantclient_19_3