Comment to 'Can't apply upgrade because the following files were modified: template/images/spl-image-main.svg-old, template/images/spl-image-main.psd, template/images/spl-image-main.svg'
Yep, the probem seems to be with your Cron Jobs. Please set them correctly following the instructions in the link i posted above. Then clear your UNA cache and run the upgrade again.