ProtonVPN before 3.2.10 on Windows mishandles the drive installer path, which should use this: '"' + ExpandConstant('{autopf}\Proton\Drive') + '"' in Setup/setup.iss.
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.