HELLO: Hope you are well. ACCPAC Plus was discontinued in 2006. Neither ACCPAC Plus nor any of the 3rd party utilities are available anymore.
You can consider migrating to Adagio by Softrak Systems which will convert all of your ACCPAC Plus data, works like and looks like ACCPAC Plus with similar reports. There is an Item Code Change utility available from Dakota Software.
https://www.dakotasoftware.com/products/toolkit-adagio/
Let us know if you are interested in seeing a demo of Adagio.