Hotstart installation

I've managed to install 3 of the 4 zip files in the hot_one_page_j25_unzip_first.zip
However the zip file titled hot_one_page25_hotstart.zip will not install because there is not xml file. It appears the files in the folder must be manually installed. Please reply with instructions on installing the files in the zip file.

That is in fact whole joomla with template, modules and demo data packed, so it's not install-able. You copy files form it to your web root like you do when you download joomla, one difference is that you need to click on "install sample data"

I have uploaded and installed the files in the hot_one_page25_hotstart zip file into my root directory. When I attempt to change the page width or add a row, I get an error message stating that Firefox does not understand the javascript command. I cannot add or delete rows using Sparky Layout Builder.

Maybe you have some very old FF, does it work in Chrome???