Update issues from V1.496 to V1.5x

Hi,

I followed the step of Beta3-14x-to-15x-upgrade-step-by-step.txt to update my OC V1.946
to V1.512 first, and to V1.551 later. The first update is ok. But there are some problems as follows,

1. After updating to V1.512, it seemed that vqmod would cause trouble in the local xampp server,
even using latest version of vqmod. Vqmod installation was successful but the local homepage and
admin page could not be entered with the error:
'Fatal error: Class 'Url' not found in E:\xampp\htdocs\OC1513\admin\index.php on line 54'
I've read the related thread. Maybe it is .htaccess issue but I don't know how to let it work.

2. During the upgrade from V1.496 to V1.512, I'm a little confused with the description of
Step 12 after the success at Step 10 of upgrade-14x-to-15x.php.
'STEP 12. RUN THE BUILT-IN OPENCART UPGRADE FOR v1.5.1.3 or LATER by visiting:
http://mysite.com/install/index.php' '
To my understanding I should use upgrade not install. As the installation script need me to
delete my database first. In that case how can I get my database back to work after updating?

3. Can I assume that the right upgrade process should be from V1.4x to V1.512 first, then from
V1.512 to further V1.5x? It can't be directly from V1.4x to the latest version 1.551, can I? As I found
there are 109 tables in V1.551 but only 90 tables in V1.512 after the updating.

4. Are the layout parts same between V1.512 and the latest V1.551? Is there a better way to backup
the layout parts only without adjusting them every time due to the errors during the updating or
re-installing process?

5. I'm testing the whole updating procedures locally. It will surely take more time when I implement
a real update online in future. My last question: is there a better way to make a quicker upgrading
shift online?

Can anyone have suggestions for me? Many thanks,

Daniel

Hi,

Refer to other threads, I made a little progress from V1.512 to V1.541
with the normal installation (or upgrade) procedure.

But when I want to upgrade from V1.541 to V1.551, the error came out again,
Fatal error: Maximum execution time of 30 seconds exceeded in xxx\system\database\mysql.php on line 22.

Had anybody successfully updated to V1.551 (not a fresh installation of V1.551)?
Please let me know how you did it. Thanks,