Reference/AllowRootDirInstall
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AllowRootDirInstall
true|false
Controls whether or not installs are enabled to the root directory of a drive, or directly into a network share. Set to 'true' to change the safe behavior, which prevents users from selecting C:\ or \\Server\Share as an install (and later on, uninstall) directory. For additional directory selection page customizability, see .onVerifyInstDir.
Command introduced with NSIS v1.80
