Hi
I have had recent issues with malware - I have also been looking to upgrade the current version 1.4.4.1 to higher (probably 1.5.X)
My main issue relates to look and feel - new templates do not match very well the original (free prestashop) version - which suits me very well.
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I am OK to go with a paid for template if it helps - but main requirement is to get the site over to a new (secure) version with minimal disruption and change to appearance.
May lead to further assistance in future to enhance site.