Confused newbie. Web Interface Says Its about to update then fails

Hey,

i think you should find quite a lot existing threads about the very same question here at the forums. I did a short search like:

https://central.owncloud.org/search?q=%22Updates%20between%20multiple%20major%20versions%20and%20downgrades%20are%20unsupported%22

and immediately found various threads and an existing FAQ below.

If i understand those messages/threads correctly your ownCloud installation is not at at the version your CP is telling you. To solve this issue you would need to research which ownCloud version is currently active and then upgrade the versions up to 10.0.10 as ownCloud is expecting it by following the suggestions in the linked threads.