@dsfIf you upgraded, you must go to permalinks settings in oc-admin and simply re-save them.Make sure that all links looks good.
@dsfIf you see 404, it is not going to be related to PHP
@dsfAs I mentioned before, permalinks should be re-saved. Everything will look ok there, but once you press save button, it is going to generate something like string/key osclass used for links decoding.
Not for now, will consider thst.
@dsf So only emails are not being sent?
@dsfWhat is name of email template?