That's not an ideal solution. I didn't realise that upgrading was going to make our previous shopping basket applications un-editable and, potentially, inoperable.
Our only option, therefore, would be to either maintain two computers or, like you say, create a new computer user with the old Dreamweaver and old eCart installed on it. Will Windows 81 Pro allow us to do that without becoming muddled with the two versions of Dreamweaver? We were hoping to sign up for Adobe CC once our Win 8.1 Pro machine arrived.
Appreciate the advice, as ever. Thank you.