Edit shopping cart created eCart 5 Dreamweaver 5.5 using eCart 6 Dreamweaver CC ?

Is it possible to edit a shopping cart I created with eCart 5 and Dreamweaver 5.5 in Dreamweaver CC with eCart 6?

Yes, you can use eCart 6 to edit a cart created with eCart 5.

and you can use DW CC to edit sites created with DW CS5.5

Currently I have Dreamweaver CS 5.5 and CC installed. Should I uninstall cs 5.5 / eCart 5 before installing eCart 6 to Dreamweaver CC?

you c an keep DW CS5.5 with eCart 5 installed along DW CC with eCart 6 installed.

you just cant install eCart 5 and 6 in the same version of DW together.

I have the extensions installed into Dreamweaver CC. In the old version there was a tab with a GUI that told you what cart you were working on and gave you a few options. How do I get that to display in the new version?

to open the eCart object panel, go to WebAssist -> eCart -> eCart Object

I created the new checkout process with the payment gateway we chose to use. Created a new Add to cart button on a product page. When I try to click add to cart I get this error:

Warning: Missing argument 13 for eCartSL_Definition::eCartSL_Definition(), called in /home/web/users/1773.admin12/sites/dev.shotlock/public_html/WA_eCart/eCartSL_PHP.php on line 339 and defined in /home/web/users/1773.admin12/sites/dev.shotlock/public_html/WA_eCart/eCartSL_PHP.php on line 4

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/web/users/1773.admin12/sites/dev.shotlock/public_html/WA_eCart/eCartSL_PHP.php:4) in /home/web/users/1773.admin12/sites/dev.shotlock/public_html/WA_eCart/WA_eCart_Definition_PHP.php on line 465

Warning: Cannot modify header information - headers already sent by (output started at /home/web/users/1773.admin12/sites/dev.shotlock/public_html/WA_eCart/eCartSL_PHP.php:4) in /home/web/users/1773.admin12/sites/dev.shotlock/public_html/ShotLock_Shotgun.php on line 42

Make sure to open the cart object window, click the edit button for the eCart object and click OK to have it updated to eCart 6.

I did what you said, now I get this...

Warning: require_once(webassist/forms/persist.php): failed to open stream: No such file or directory in /home/web/users/1773.admin12/sites/dev.shotlock/public_html/cart/cart.php on line 1

Fatal error: require_once(): Failed opening required 'webassist/forms/persist.php' (include_path='.:/usr/local/php-5.5.9/lib/php') in /home/web/users/1773.admin12/sites/dev.shotlock/public_html/cart/cart.php on line 1

that error means the webassist/forms/persist.php file has not been uploaded to the server.