Creating update with NSIS

Question

I create my setup`s with NSIS. Now i faced with updates. Is there examples of how to create nsis installer with this functionality:

• detect older version
• delete files
• set new files

Thanks in advance

P.S.: Sory for my bad english

Answer 1

What about running uninstaller of old version (Execute uninstall.exe in target directory) and then installing new version?

I think it is the simplest way and there is no effort for you as each software (usually) has uninstaller.