When a type of referenced assembly is used in some class, JustDecompile prompts for the location of this referenced assembly in order to produce better decompilation result. If you skip it, there might be some parts of the code highlighted in red. When hovered an explanation why this code is highlighted is shown.
In your case your dll has a reference to that "1.0 framework" and that's why it prompts you for path to it.
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