[xwiki-users] How the first upgrade of xwiki was unsuccessful.

Configuration files were migrated correctly. When I restarted tomcat and tried to log in XWiki, xwiki started a wizard. It downloaded the default XAR, and I saw an inverted triangle to the right of "CONTINUE" button. When I moved the mouse cursor over the triangle, I saw a drop-down menu with "INSTALL". I thought "INSTALL" would install the default XAR, but when I clicked it, I saw the button replaced with a text saying "#execute..." or "#hold...."(I can't remember the exact text). I assumed xwiki failed to merge the new default XAR with the old XWiki. So I clicked "Skip" and continued migration process. I'm not sure if database migration was successfully done because I failed to merge the new default XAR via the wizard. I tried to import the new XAR, and I chose "Replace the document history with the history from the package" instead of "Add a new version to the existing document". That choice was ok except I had to uncheck some documents that contain information of user, right, and password. Thus, the Main space WebHome was overwritten, and the admin password was reset to "admin". Please share your experiences with me. I want to do a lot better next time.