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Paymee is fully compatible with both 32-bit and 64-bit Windows

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Paymee is fully compatible with 32-bit Excel (Excel 2007 or newer).  Note Paymee is no longer supported as of March 2021, compatibility with future versions of Excel/MS Office is not guaranteed.
 

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Paymee is not compatible with 64-bit Excel (part or 64-bit Microsoft Office).

To Check if your Excel is 32-bit or 64-bit, refer to the 'About Excel' dialog...

...instructions to check this vary with each Excel version.  For instructions to check your Excel version, please Google "Check if 32 or 64 bit Excel " + your Excel version.

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Per Microsoft, the 64 bit Office is recommended for "Excel expert users who work with Excel spreadsheets that are larger than 2 gigabytes (GB)". Source: http://technet.microsoft.com/en-us/library/ee681792.aspx
 

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If you don't work with spreadsheets that are larger than 2 gigabytes, you may want to consider getting the 32-bit Excel.
 

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Microsoft Office usually comes with both 32 & 64-bit Setups.  A full UNinstall of 64-bit Office is needed to install 32-bit Office/Excel.