Why am I unable to install/upgrade and see errors about Mylyn Bridge: PDE (org.eclipse.pde.ui) missing?
If you are running an Eclipse distribution that doesn’t have pde installed such as the Eclipse IDE for Java Developers build or Java EE build, you will see this error upon upgrading Tasktop via the Find and Install… menu option. Simply deselect the Mylyn Bridge plugin under the Integration group and the installation will proceed correctly. To bypass this all together, you can update your Tasktop using the Check for Updates link found under the Configuration section on the Tasktop Feature Overview (accessible by pressing the Tasktop Home button in the toolbar).