Hi,
Please backup your Database and all catalog files like includes and your admin folders before you install this payment module. I install Innovative Gateway on payment module by following steps:
1. Register SSL for your dedicated IP
2. UNZip the download file, http://www.zen-cart.com/archived_con...ions1_1_.1.zip
3. Update below codes for the file, innovative.php in /includes/modules/payment/ folder at your local PC, then FTP this file and other files to your corresponding folders on the server.

Change below Code:

$message = sprintf(MODULE_PAYMENT_INNOVATIVE_TEXT_ERROR_MESSAGE, strip_tags($result[1]));
zen_redirect(zen_href_link(FILENAME_CHECKOUT_PAYMENT, 'error_message=' . urlencode($message), 'SSL', true, false));

To Code:

global $messageStack;
$messageStack->add_session('checkout_payment', MODULE_PAYMENT_INNOVATIVE_TEXT_ERROR_MESSAGE . $result[1], 'error');
zen_redirect(zen_href_link(FILENAME_CHECKOUT_PAYMENT, '', 'SSL', true, false));

4. After FTP files, click Install for Credit Card on Admin-->Modules-->Payment. when done installation, click rightside "edit" to update Payment Server from "http....." to be https://transactions.innovativegatew...ateway.aai.Aai

5. run test, uncomment line 67 (remove //) if ($username == 'gatewaytest')....for file innovative.php under /includes/modules/payment/ and type the gatewaytest userid on Admin-->Modules-->Payment, CC setup for testing setup. Please make sure to comment out line 67 if you run it on live.

My shopcart, www.everytihgmyhouse.com is running this module without no issues. Hopefully above steps could help you!!