For this purpose we have designed and developed process that allow you to upgrade AbanteCart right in your admin.

You should have gotten a message in your Admin with the link that you can click to upgrade it.

If you do not have message you can go to "Package Installer" In Extension -> Install Extension.
In the input field copy/paste key abantecart_upgrade_110 and click continue.
Follow the upgrade steps.

Note: If you do not have write permission for some files, you can use FTP credentials as will be prompted or change all permissions on needed files to be writable.

This process backs up your system automatically.

For old fashioned way to upgrade:
Download upgrade package from http://code.google.com/p/abantecart/downloads/list
Open archive and copy content of code directory to your AbanteCart directory.
Run included upgrade.sql file in Mysql

This is all.

This looks like you have very small execution time set.

Try below in .htaccess or php.ini file

php_value max_execution_time 90

This issue is addressed in new version 1.1 that we are preparing for release today.

If you do not want to update and willing to change the code, I can give you instructions on that. I would recommend to update, because there are more issues that are fixed in upcoming version not to mention new features.

The correct ink to admin it based on what is set during installation process of the AbanteCart

yourdomainname.com/index.php?s=[your_admin]

[your_admin] is provided during installation and can be located in system/config.php AFTER installation.

Below is INCORRECT

yourdomainname.com/index.php?rt=index/login&s=your_admin

Key is used only with marketplace. For manual installations, there is no key needed

1. Please double check that you have selected correct store for the product
2. Rule of the thumb to clear cache in case something is not updated.

Unfortunately, there are no instructions yet. This was experimental, but we have big plans for it. We plan to extend to create developer tools. This will be worked on right after major release v1.1

You can simply click though it and if you have any questions, please post.

One more thing you can try.
Increase PHP memory limit.
This is located in php.ini file

Change:
memory_limit = 64M;
TO:
memory_limit = 128M;