After backup that made my hoster, I do not find the former JoomSEF component to component menu.
I can not find the old version installed in the root directory. What should I do?

Hi,
I bought and downloaded successfully com jommsef4 (247ca581b13252fcdb5463d7b0c48179)
But when I try to install a component, appears to me an error:
Download ID not set.
Component Install: Custom install routine failure
How do I solve this problem?
I had installed version 3, with the upgrade to version fourth Domain is a recently collapsed and I lost JoomSEF component after backup. Then I decided to buy the new version 4, but now I can not install.
Please help me solve the problem. Thanks