To upgrade:
If you are running any earlier 6.4 release, including -rc releases, click 'Check for Updates' on the Tools/Update OS page.
If you are running a previous stable release, clicking 'Check for Updates' on the Plugins page.
This is a point-release, containing mainly bug fixes and minor improvements.
In addition, this release contains additional security updates related to the recent Meltdown and Spectre vulnerabilities. For this reason, all users ar