Be very careful of who you buy older versions from. There are too many stories of pirated copies, virus problems and installation issues.
Projects from old versions may open in newer versions. There has not been any titler module change that would be obvious to users. Instead, each version will have incremental changes. If the titles (and other added effects) you used remain unchanged the older project will open in the newer version. But, if the coding for one of them changed, your project may crash. It may also do damage to the project file so be sure to experiment with copies of project files.
I hope you have saved good copies of finished output from your projects. Your only choice may be to use them as source files in another video editor of your choosing.
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