IIRC, the pop-up pops up for each warning, so you have to click several times,
and on very old savegames, "several" = "tens"...
Avoiding to load the savegame at first warning is, imho, not a good idea,
because sometimes such a warning is really a warning and the game will run
We could however perhaps open the pop-up only once, and if there are to many
warnings tell the user that its savegame is definitely too old to be safetely