I need to upgrade SSPR 3.0.0.1 to version 4.1.x. SSPR 4.1.x, which requires tomcat 8 or later and the current tomcat version being used in tomcat 7.
1. How can I make the tomcat upgrade, if you can please detail the steps ?
2. During upgrade can I somehow have the provision to keep the older deployment and switch back (fall back) to the previous SSPR deployment on older tomcat by making minor changes in case there are issues with the new deployment? If possible, how can I get this done.

Thanks!