[Baertram]

Open the file iView.lua with a texteditor and search for this line (line 267):

if not SWF:IsAddonVersionSameGameVersion(API[1], API[2], ADDON_NAME) then return end

Change it to a commented line by adding the prefix --

--if not SWF:IsAddonVersionSameGameVersion(API[1], API[2], ADDON_NAME) then return end

Save the file, do a /reloadui ingame and try if it works then.

You can also change the ## ApiVersion: xxxxxx inside the iView.txt file to
##ApiVersion: 100025 100026

This will make the addon stop saying it's outdated.