The OpenSSL install is fairly straight forward with only a few default setting changes (one due to a bug in cmake).
The default folder is C:\Program Files (or C:\Program Files (x86)) as shown below, this needs to be changed.
Ensure you change the path to: C:\OpenSSL-Win32 or C:\OpenSSL-Win64
Change the following setting to 'The OpenSSL binaries (/bin) directory)
If you want to make a donation to OpenSSL (another open source project) please tick the required box, but you are free to unselect all the boxes.
Please should complete the installation of OpenSSL