CCS installation failures can occur when AV real-time scanning is enabled due to the way some AV products work. The problem is not with false-positives, but rather with the way some AV products lock access to new files while the content is scanned. As content is downloaded and extracted, the real-time scanner may lock a file long enough that the installation process thinks the file cannot be accessed. There are retries built into the installation process, but if it happens enough the installation process may eventually fail because the retry count is exceeded.
It is easy to address this issue in the software CCS directly controls. It is more difficult to address this in third-party and open source software. Part of the installation process uses Eclipse p2 to install Eclipse features. This area has been problematic to address, but we have made some improvements in v6.0.1 (which should be out in approximately a month).
In our testing, the most sensitive AV product we have found is McAfee. The timing and duration of its file locking activities were causing the most installations issues. Many AV products do not cause issues with installation, but it is difficult to know in advance which ones will cause issues.
If you have the ability to temporarily disable real-time AV scanning during installation, it can have the added benefit of improving installation times. I certainly understand that not eveyone will be able to disable the AV scanner - even temporarily.