Same problem both off and on line ?
"it downloaded fine."
If there are no corrupt files from the download, it may be a corruption in the UPlay client.
Have you tried verifying the games files ( R/click on the game title in your UPlay Library and click on verify ) ?
If the UPlay client is the source you need to download the latest UPlay client installer directly from Ubi-Soft,
and reinstall your current UPlay.
I've seen it suggested for this issue, that after uninstalling, and before reinstalling the UPlay client,
you may also need to do the host file fix below , but I just had a look in the folder,
and found there are a lot of backups.
In my case renaming the first backup (rename the original hosts file, eg- 1ahosts , and the backup file to hosts )
would result in the same as the fix below.
- Navigate to the 'hosts' file located at C:\WINDOWS\system32\drivers\etc
- R/click on the file named 'hosts' and choose the 'Open With..' > Notepad .
- Delete any entry below this one (best to make a copy of the file before altering it ) -
127.0.0.1 localhost
::1 localhost
- Or, it could be a conflict with another software , or your Anti-Virus or firewall may be blocking it.
.