6. Select “Use a license file” and click on the circled button shown below
7. In the Open dialogue box browse and select the saved license file and then click on open (Note: change the file type to All files, if required)
8. Click on Next > Finish
Using Environment Variable:
Above steps are valid only if installation is successfully completed. If installation had failed due to error "The install was unsuccessful because of the following serious errors: Mathcad Configuration A problem was encountered during the MSI installation" then follow below instructions:
Mathcad 15 is working. I tried all the options but every time I got to towards the end of the installation process, I got the message about the missing MSI file, and then after closing that window, the next window would say that Mathcad was installed. But, there was no shortcut shown so I did not think that the installation was available. Just before writing this response, I went to check in the Program Files folders for Mathcad. I found the Mathcad 15 application file, and started it. Well, Mathcad 15 worked. Thanks for the help.