After the free SSL certificate expired, this website has an error on chrome about “invalid SSL certificate”. I googled this error and there are several articles about this issue but it looks difficult at least for me.. So I sent an email to simply.com and hthey give me a good tip.
1. Remove invalid SSL from simply website
2. Make a new SSL certificate again from zeroSSL and download it
3. Import it on simply website
4. Activate it (HTTPS beskyttelse)