You do not have to uninstall Bible Analyzer 4, but if you are not going to use it anymore it is best to go ahead and uninstall. When uninstalling, you will be given an option asking whether to delete your modules. Click "No" and they will stay and be available for version 5.
Developer, Bible Analyzer
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Rom 4:5 AV)