Go into Windows Start Menu or Windows Settings and search for “Environment Variables.” You can use the quick search like shown in my first screenshot. There are several ways to go about this next step and it depends on your version of Windows too.Extract the contents of the zip file to a folder, such as C:\instantclient_19_6.The latest version is 19.6.0 and basic light package has all you need to connect to a database and run some queries in about a 40 megabyte zip file.If you need a 32-bit client, then download that and install 32-bit version of Toad for Oracle. If you're going to be using a 64-bit version of Toad for Oracle, then you should download and install the 64-bit version of the Instant Client. Visit and search for "instant client" or click here.How to quickly install an Oracle Instant Client and connect to a database using Toad for Oracle
Here are my steps to quickly install an instant client and connect to a database using Toad® for Oracle. And sometimes, like in my situation, they're just handy to have in order to quickly test compatibility between different client, database, and application versions. It's also helpful when you don't have access to run full clients on the computer you're using - for example, a contractor who is using a loaner laptop. Instant clients are really helpful when you don't need to install all the utilities and drivers of a full client. What saved me a lot of time in testing and figuring this out was installing different versions of the Oracle instant client rather than having to install the full client for each test. It took a lot of trial and error until I realized it was because I was using an Oracle 19c client to connect to an Oracle 11g database-and they are not compatible. I was having a hard time trying to connect to one of my test databases.
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