Licensing question

We have been working on a project with a developer and his work has been in version 3 of the library, however we purchased a commercial license after you changed to version 4.  When we have tried to use the 4.1 library it is causing a lot of crashes, but is stable under version 3,.

So our question is will our license cover a previous library version?

Yes, that'd be fine.

(If you're having problems with V4 and they turn out not to be "developer error" then please let us know so we can help fix them!)

Thanks for claryfing Jules. Will let you know if we find any issues when we rebuild this after release.