I've just installed the recently-corrected version of 2.8.3.
Ths Settiings Page can be accessed and the selected features seem to be working.
However: the graphs still do not appear; the "Avg Pageviews" reads 0.
(The Overview graph does appear in the WP-Slimstat dashboard version.)
Although the Contents choices in the Settings Page mention tracking downloads, I don't see a "Downloads" stat appear.
Thanks for your prompt responses.