I downloaded the latestversion you linked to and I get the following output
Cleaning up all deleted bugs and related tables
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
Cleaning up project tables
(35 row(s) affected)
(21 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
(0 row(s) affected)
Deleting orphaned records in user projects table
(8 row(s) affected)
Deleting orphaned records in user roles table
(9 row(s) affected)
(0 row(s) affected)
Updating bugs with orphaned assigned user ids
(0 row(s) affected)
Updating bugs with orphaned reporter user ids
(0 row(s) affected)
Updating bugs with orphaned last updated user ids
(0 row(s) affected)
Updating bugs with orphaned components
(0 row(s) affected)
Updating bug attachments with orphaned users
(0 row(s) affected)
Updating bug comments with orphaned users
(0 row(s) affected)
Updating bug history records with orphaned users
(0 row(s) affected)
Deleting bug notifications for orphaned users
(0 row(s) affected)
Updating bug time entries for orphaned users
(0 row(s) affected)
Updating project creators with orphaned user ids
(0 row(s) affected)
Updating project managers with orphaned user ids
(0 row(s) affected)
Updating project mailboxes with orphaned users
(0 row(s) affected)
Updating bugs with missing versions
(225 row(s) affected)
Msg 2714, Level 16, State 4, Line 2
There is already an object named 'FK_Bug_Component' in the database.
Msg 1750, Level 16, State 0, Line 2
Could not create constraint. See previous errors.
(1 row(s) affected)
Msg 547, Level 16, State 0, Line 2
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_Bug_FixedInVersionId". The conflict occurred in database "aurion_issuetracting_bugnet", table "dbo.Version", column 'VersionID'.
(1 row(s) affected)
Msg 2714, Level 16, State 4, Line 2
There is already an object named 'FK_Bug_Priority' in the database.
Msg 1750, Level 16, State 0, Line 2
Could not create constraint. See previous errors.
(1 row(s) affected)
Msg 2714, Level 16, State 4, Line 2
There is already an object named 'FK_Bug_Project' in the database.
Msg 1750, Level 16, State 0, Line 2
Could not create constraint. See previous errors.
(1 row(s) affected)
Msg 2714, Level 16, State 4, Line 2
There is already an object named 'FK_Bug_Resolution' in the database.
Msg 1750, Level 16, State 0, Line 2
Could not create constraint. See previous errors.
(1 row(s) affected)
Msg 2714, Level 16, State 4, Line 2
There is already an object named 'FK_Bug_Status' in the database.
Msg 1750, Level 16, State 0, Line 2
Could not create constraint. See previous errors.
(1 row(s) affected)
Msg 2714, Level 16, State 4, Line 2
There is already an object named 'FK_Bug_Type' in the database.
Msg 1750, Level 16, State 0, Line 2
Could not create constraint. See previous errors.
(1 row(s) affected)
Msg 547, Level 16, State 0, Line 2
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_UserRoles_aspnet_Users". The conflict occurred in database "aurion_issuetracting_bugnet", table "dbo.aspnet_Users", column 'UserId'.
(1 row(s) affected)
(1 row(s) affected)
Database synchronization script failed