If you have multiple variants of PC Access installed on a single PC, the order in which you install updates is important.
Why? When PC Access is installed it creates a file association for “.PCA” files. File associations allow Windows to launch an application when you click on a file associated with that application. Just as notepad will open if you click in a .TXT file, PC Access will open if you click on a “.PCA” file.
The problem: You can only have one association per file type. So when you install Dealer PC Access it creates an association so that when you click on a “.PCA” file it will launch Dealer PC Access. Now, if you then install or upgrade the User version of PC Access, it will associate “.PCA” files with the USER version of PC Access - when you click on a “.PCA” file it will launch the USER version of PC Access.
The solution: If you have multiple variants (Dealer, User, Lumina) of PC Access installed on the same PC, you should install/upgrade the one you want to be the "default" variant last. In most cases this will probably be Dealer PC Access.