I dont know where the confusion arises after posting the new links. There are multiple scenarios :
1. Old versions - If TSA is working, continue to use. Install the Terra updates only and if Terra works, fine.
2. Uninstall old version - There is no need of uninstall as installing the new versions DOES NOT uninstall the old version ( as i have seen). The new version files are just copied/overwritten. In this case, the patch files are needed.
3. Difference between TSA and Terra - TSA is the base version. Terra works on top of that, it requires a basic TSA version to be installed. Without TSA, Terra wont install and work! To put it simply, TSA is basic, Terra is Advanced but you need the basic installation.
I am seeing people asking all kinds of questions and help, but none posting their findings, useful strategies, hints which might help others. Those who are posting something, posting in an obfuscated way. I am a bit disappointed.