you need to replace file if you plan to upgrade without ftp. Otherwise replacement not needed.
In case when your web-server does not support ftp-connections you need to replace file (save by "raw "button)

hm.. you can replace manually this file by file from our upgrade package that placed here http://code.google.com/p/abantecart/downloads/list

can you say is your file
public_html/admin/controller/pages/design/content.php is the same as https://github.com/abantecart/abantecart-src/blob/master/public_html/admin/controller/pages/design/content.php ?

i guess you should enable setting "No Stock Auto Disable" in menu system->settings->tab "General" or just type 'nostock' in global search field at the top

hi.
i guess you have all orders in your database but google api can't to change order status during checkout process.
you should to check intergation console on a google side and be sure that abantecart callback-controller is available for google api.
Also you can press HELP button on abantecart's google checkout settings page.

but now you can change order statuses for that hidden orders manually..(open phpmyadmin, open table orders and change column order_status_id from 0 to 1)

p.s. please do not use CAPSLOCK

it's a bug. to fix it you have to replace file public_html/extensions/banner_manager/storefront/model/extension/banner_manager.php by attached
thank you.

this is
"Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request."
try to ask hosting provider support about this. probably their firewall block some requests.

hmm...are you sure that you toggle WYSIWYG editor to source-mode on html-block edit page? your code works well for me.