title: Can't update ThemeKit, "Access is denied"
body: <p>So I've been using ThemeKit to build a Shopify theme and I've been getting a notification in the command-line window that ThemeKit has an upgrade available. It says to use <code>theme update</code> as the command to run to get this done but when I do I get this error message, <code>Could not update and had to roll back. open C:\Program Files\Theme Kit\.theme.exe.new: Access is denied.</code> Anyone else have this issue? I'm working on Windows 10 if that helps...</p>