The OpenTShirts Product designer script is a tool for OpenCart that allows you to offer product design features to your customers, via the web browser. It is one of many online custom design tool software, similar to LiveArt Designer Tool, which are becoming more and more popular for small businesses this days. For end-users this online designer tool is incredibly easy to use, and the developers have done as much as possible to make installing OpenTShirts as easy as possible, but there may still be some things that you will need to change.
To use OpenTShirts, you will need to have OpenCart installed. We will show you how to do that, and it’s easier than Data Protecting we have explained already.
If you are creating a brand new store, install OpenCart and then go through the setup wizard to configure your store’s primary settings (such as the business name, contact details, preferred currency and units of measurement).
Once OpenCart is up and running, OpenTShirts can be installed in much the same way as you would install any other plugin – simply upload the plugin using your favorite FTP client, and enable the plugin using the Extensions/Modules menu.
It is important that you take the time to configure the primary settings before you install the OpenTShirt product designer because OpenTShirt takes settings from OpenCart. If you install OpenTShirt with the default OpenCart settings then you will need to spend even more time sorting out units of measurement and sizes, when all of those details could have been imported automatically.

Important Configuration Changes

After enabling the plugin, you will need to make some changes to the php.ini files in your Admin directory and also to the same file in the shop directory. Your php.ini should look like this:
magic_quotes_gpc = Off;
register_globals = Off;
defaut_charset = UTF-8;
memory_limit = 64M;
max_execution_time = 18000;
upload_max_filesize = 999M;
post_max_size = 999M;
safe_mode = Off;
mysq.connect_timeout = 20;
session.use_cookies = On;
session.use_trans_sid = Off;
session.gc_maxlifetime = 120000000;
allow_url_fopen = On;

If you are setting up your store for the first time, make sure that once you have completed the installation process you delete the Install folder. This is very important! If you leave the install folder on your web server then you are leaving it open to unauthorized access by malicious users or by hackers. As soon as you are satisfied that the installation has worked, and you have logged in to your admin panel, remove the install folder to protect your website.