How do I know which version of FCS Express I have?

You can access version information for your copy of FCS Express 5 or greater by accessing the About FCS Express window via File tab > Help > About:

The second line in the About FCS Express window will contain the current version number you are using.  You may copy the version number and other information from this window to the clipboard using CTRL + C for PC or ()+C for Mac.

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