Suite upgrading from 3.8.5 to 4.0.5
 

Got a Problem while upgrade to 4.0.5

i already use "blogs" as an add-on in my board users already posted there so i have an massive use of this feature.
While upgrade to 4.0.4 all is ok but when upgrae to 4.0.5 the update manager reaches step 5 and i receive

Database has encountered a problem.


MySQL Error : Table 'vb_blog_categorypermission' already exists
Error Number : 1050

i "can" solve this by delete my entire blogs.. but i dont want to.
its not worth updating to a new version if i will lose all my blogs!

any suggestion how to solve this?