Hi,
Thank you for your feedback.
For the 3 warning messages from the admin log, I've made some patches to fix them in future versions of HikaShop.
These are small issues that don't cause problem for now. You can ignore them and when you update your HikaShop to the next version in the future, you'll get patches for it.
For the last 2 warning messages, these indicate that you've activated the HikaShop rates auto update plugin via the Joomla plugins manager but that the configuration of your server doesn't allow your website to access outside URLs, which are necessary for this plugin to work. And thus, your currencies rates are not being updated.
So either you need to disable this plugin if you don't have several currencies on your website, or you need to check with your hosting support how you can enable the allow_url_fopen setting of your php.ini to allow for this plugin to work.