I do not have "crx-repository" option on the Modules screen. The closest option I have is "Content Repository, version 6.4.0" in the "OSGi Capabilities" section. Is this the one? If yes, what is it for? As I mentioned before, we currently only use the "Document Security" module in the "JEE Capabilities" section, to protect PDF documents.
Another question - what am I actually trying to install? I thought "AEM-Forms-6.4.1.0-WIN-5.1.14.zip" was an update for AEM Forms from v6.4.0 to v6.4.1. But maybe I misunderstood what it is? I have just started looking at AEM Forms, to upgrade our production which currently runs LiveCycle ES 4. All updates I used to install on LiveCycle in the past where coming with an exe to run.
Thank you for your help!