"..... is not writable" error when installing Primavera Integration API

When I tried to install Primavera Integration API v6.2.1, no matter which location I chose it would say "xxxx is not writable". I never had that issue for any software installations on this computer. I restarted many times but still not working. I googled and the only possible solution is on Oracle Support, as shown in the below link. However it requires Support Identifier to view, which I don't have. Can anybody with that permission please post the resolution here, or email to me codeviny@gmail.com? Thanks.

https://support.oracle.com/knowledge/More%20Applications%20and%20Technologies/2075293_1.html