Lifetime upgrades?

I may not understand correctly your question, but do you mean if you can use in FF 10 ANY filter from any previous version available?

With Filter Forge 10.0 Professional Edition you can use ALL of the filters available in the filter library because it is compatible with all the previous versions.

The upgrades of lifetime will be for example, version 11, version 12, etc. because all the updates for FF 10 itself are included free until the next new number version appears.

So if you buy the lifetime upgrade you will never have to worry about any problem with any version as you will have all of them when they may be released and available.