Downloaded 3.8 version not running, still 3.7.4

[dbahn]

I followed the steps to upgrade from 3.7 to 3.8, changing the upload file name to "forumvB" and uploading it to that directory. I uploaded the install file to the same directory.

Loging into the .../install/upgrade.php url I get the following error message:

So I re-downloaded the VB 3.8.1 today, unzipped it and went through the steps again as described on the support site, but get the same message.

What's the next step? Did I leave one out? I don't quite see how downloading the 3.8.1 version doesn't "run" it.

(I tried the first "click here" option, which didn't do anything. I didn't want to try the second one until I checked here first.)

Edit:
Also, since downloading ver 3.8.1, I've gotten this email twice now:

Database error in vBulletin 3.7.4:

Invalid SQL:

SELECT socialgroup.groupid, socialgroup.name, socialgroup.description, socialgroup.dateline, sgicon.dateline AS icondateline,
sgicon.thumbnail_width AS iconthumb_width, sgicon.thumbnail_height AS iconthumb_height
FROM vbsocialgroupmember AS socialgroupmember
INNER JOIN vbsocialgroup AS socialgroup ON
(socialgroup.groupid = socialgroupmember.groupid)
LEFT JOIN vbsocialgroupicon AS sgicon ON sgicon.groupid = socialgroup.groupid
WHERE
socialgroupmember.userid = 448
AND socialgroupmember.type = 'member'
ORDER BY socialgroup.name;

MySQL Error : Table 'dbahnvt_vbulletin.vbsocialgroupicon' doesn't exist
Error Number : 1146
Request Date : Saturday, March 7th 2009 @ 10:31:04 AM
Error Date : Saturday, March 7th 2009 @ 10:31:04 AM
Script : http://woodenpropeller.com/forumvB/member.php?u=448
Referrer :
IP Address : 72.30.78.220
Username : Unregistered
Classname : vB_Database
MySQL Version :

[dbahn]

Sorry, I couldn't delete the above post.

It's upgraded. Even though I thought I removed the install.php file from the install directory (it didn't show on the server), I went back and deleted it from the folder on my computer then re-uploaded the install folder and that seemed to have fixed it.