Problem with certificate

[regnregn]

only in slimjet i have on many sites an error about the certificate, e.g.

raccoon.onyxbits.de
also
wetter.de

(No external links allowed for new users)

it shows
NET::ERR_CERT_AUTHORITY_INVALID
if i check the certificates, i find:
it is always the root certifice , either not valid (expired 30.9.21) or something else

but other browsers have no problem! Why slimjet?
it is very nasty alwasy to click 2 times "continue"
Any help would be very much appreciated

[oftentired]

if this problem persists uninstall Slimjet and then reinstall using the offline installer