Revising Websites

I am looking for two things to be fixed, here is what I am looking for: Part One Currently my website is built with dreamweaver and uses cartweaver as the shopping cart function. I am running version 5.6 of PHP. When I try to use PHP 7.3 I get a 500 read error that says there is an “internal server error”. When I revert back to 5.6 PHP the site works fine. The issue relates to the shopping cart software. The company that originally wrote the code for cartweaver is no longer in business. On their website however they did provide a patch that is supposed to work with PHP7. That link is below: [login to view URL] I would like the sites to work with PHP7. Part Two I would like to put an inventory message box on the product details page (example below) [login to view URL] I have attached two images showing what the layout should look like and the second image shows what the colouring should look like. I am not a coder but can work within the code once I know where and what needs to be revised. Either the person who does this work can do the revisions themselves and upload the revised sites or can tell me what to do or I will fix it myself. I do not want my site being used to do the revisions. If you are doing this work you can download the site and work on it on your own network. I do not want to see my site down while the work is being completed. I can provide you with an FTP which will let you download both sites. I have two sites that need these revisions: [login to view URL] [login to view URL] I’d like to know what you will charge to do this work. If I feel the price is fair I will send you an FTP link so you can download both these sites.