How can I upgrade Reckon accounts Plus 2014 R1 to the R3 version so I can use my backup?

I am using Reckon accounts Plus 2014 R3. I had to do a reinstall which left it as version R1 but it will not install my backup file because it was saved in R3. How can I go about upgrading to the R3 version so I can use my backup? Thanks in advance.

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