Upgrading from v2.4.0 to v3.0.0

If you customized controllers, check new controllers and adapt your ones. Controllers now extend Symfony's AbstractContoller instead of Controller and use render method instead of Template annotation.
If you extended UserManager or LightUserManager, check new type hintings and return types. Also, customization configuration changed, and options to specify classes has been removed. You need to define alias and use autowiring now.

Upgrading from v1.4.0 to v1.5.0

Routes has been adjusted to be more meaningful, adding method constraints. So, templates received minor modification, mainly in form tags: if you overrode templates, you need to check such changes and possibly adapt your customizations.
Route "user" has been moved, it was on "/user/" URL, now is on "/user" (without trailing slash).

From version 1.3.0, the dependency from KnpPaginatorBundle is optional. So, if you do not require that bundle, you can remove all references from your project. If you customized controller or template, please check the differences in User module.