WSPR version numbering

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Anonymous (not verified)
WSPR version numbering

Hi all,
Hopefully not a silly question but I wonder if someone could clarify the latest version for gqrx and the User Guide. I have just downloaded and compiled what I thought was version WSPR 2.0 or 2.11 but on running the program the top line says WSPR 4.0 r3015. See attached.

I note that the Folder contains a User Guide that says V4. However, lists V2 and 2.11 as the latest software.

Kind regards,