The latest update https://www.xnview.com/update_xnviewmp.html displays that 1.8.8 is 1.8.0 in the properties>details and after running the installer, within the setup package, it says it is also 1.8.0.
I did not run the installer setup completely, I canceled out. Additionally, the portable package also states xnviewmp.exe properties>details as 1.8.0 and yet after running xnviewmp.exe the help displays as 1.8.8
Update 1.8.8
Moderators: helmut, XnTriq, xnview
Re: Update 1.8.8
Absolutely, that trailing 0 threw me off. 
