Thank you both for trying to help. As mentioned both the Tastyigniter systems logs and the server logs do not show anything. I did not have a child theme installed. To make the install work followed the steps on vanilla install on sub-domain. This worked, even including extensions and theme downloads and activations. However, as also reported by someone else and witnessed by me the test emails worked well, but they did not work for the ordering system (no emails sent). I then checked sending a test email from an email template, but that did not get sent. Changing to SMTP same, the test email in settings worked but not sending anything else. Anyway this is side remark, as issue remains, not being able to install extensions and orange theme because of error presented. I will yet again try a complete install, although I feel Einsteinās definition of insanity mterializing and therefore really appreciate any help which obviously should help the community here when facing similar issues. š
