Windows operating system, XP or later
TradeStation 8.7 (Build 3085) or later
or MultiCharts 5.5 (Build 2723) or later
Microsoft Excel 2003, 2007 or 2010

For the original XLInputs installer, the following is necessary:
– Microsoft Office 11 PIA
– Typically this would have been installed by default with Excel 2003
– If the default or full installation of Excel 2003 has not been installed on the target machine, you may need to install the Office components here: Office 2003 Update: Redistributable Primary Interop Assemblies

For the 2010 XLInputs installer, the following is necessary:
– Microsoft Office 12 PIA
– Typically this would have been installed by default with Excel 2007 or 2010
– If the default or full installation of Excel 2007 or 2010 has not been installed on the target machine, you may need to install the Office components here: 2007 Microsoft Office System Update: Redistributable Primary Interop Assemblies

XLInputs installers should prompt to install the .NET framework if the necessary components are not found on a machine. However, you may need to install or run a repair operation on the .NET framework. Do this by visiting Microsoft here: Install or Repair .NET Framework 4

Note that the following XLInputs installers are available:
XLInputs_2010_setup for TradeStation where Microsoft Office 12 PIA is available (installed with Excel 2007 & 2010)
Now included with XLInputs_2010 is also the original XLInputs installer for TradeStation users preferring the older Office 11 PIA
XLInputs_MC_2010_setup for MultiCharts where Microsoft Office 12 PIA is available (installed with Excel 2007 & 2010)
Now included with XLInputs_MC_2010 is also the original XLInputs installer for MultiCharts users preferring the older Office 11 PIA

To see which version of Microsoft Office Primary Interop Assemblies may be installed on your machine, refer to the following location:
…\Program Files\Common Files\microsoft shared\
for Office11 and/or Office12 folders as seen here:
PIAs_8-5-2011 10-21-34 AM

If you need to install the PIA for Excel 2010, the installer for Excel 2007 above should work. However there is a specific installer for Excel 2010 here:
Microsoft Office 2010: Primary Interop Assemblies Redistributable