@Ted8533 You cannot install two copies of the 2021 desktop software on the same computer. And why are you trying to do that? The CD/download can be used to prepare and e-file up to five federal returns; if you need to file more than five federal returns they have to be sent by mail. Five is an IRS limit. Installing a second CD will not "beat" that limit. And all versions of the desktop software have all of the forms and schedules. You can upgrade the first CD to a higher version if you think you need a higher version.
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