Database was from VB 3.5.4, if I remember correctly. I searched for the version in the database, and as best I can tell, it was upgraded at least once, from version 3.5.3, to version 3.5.4. I could find no reference to version 3.6, 3.7, or 3.8.
I used your sql file, which has an MD5 checksum of 2f00e44f64d25199c7e3eabe50e5b7ee. I also downloaded it from the server, and checked its MD5, and got the same thing. It gave me the following errors:
Converting...
Converting members... Successful.
Converting categories... Successful.
Converting boards... Successful.
Converting topics... Successful.
Converting posts (this may take some time)... Successful.
Converting polls... Successful.
Converting poll options... Successful.
Converting poll votes... Successful.
Converting personal messages (step 1)... Successful.
Converting personal messages (step 2)... Successful.
Converting topic notifications... Successful.
Converting board notifications... Successful.
Converting smileys... Successful.
Converting attachments... Successful.
Converting avatars... Successful.
Recalculating forum statistics... Successful.
Unsuccessful!
This query:
REPLACE INTO {$to_prefix}settings (variable, value)
VALUES ("conversion_time", 1255113953),
("conversion_from", "vbulletin35_to_smf.sql");
Caused the error:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '{$to_prefix}settings (variable, value)
VALUES ("conversion_time", 1255113953)' at line 1
UPDATE:
My forums are showing up now. I'm not sure what the error above screwed up.