Hey everyone, there are many reports of failing installation on certain products when trying to install them on an external hard drive on MacOS 15.5 and 15.6.
The Native Access team is investigating the issue.
In the meantime, the workaround would be to first install the product on your system's drive (if you can), move the library to your external hard drive and then locate/relocate it in Native Access.
The products affected so far: Reaktor instruments and libraries, Symphony Series, Bioscape and a few older Kontakt libraries.
Our apologies for the inconvenience, we'll update the thread as soon as there is more information to share.