I am trying to install an add-in supplied by my professor on excel:mac 2011, and I get the error in the title. I have attached the .xlam file saved as a .xlsm and included a link to school webpage where the original files are located. Please help me fix this issue! I am new to macros and vba, and have searched google for a possible solution but found nothing. Thanks for anything you can provide! http://www.me.ua.edu/ExcelinME/heat.htm HeatTransfer.xlsm
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