Go to your website Control Panel and you should see access to phpMyAdmin ...
Find your database and check the box for: admin_activity_log
At the bottom of the screen is a dropdown with: Empty
Empty the admin_activity_log ... this will remove all records from it ...
Next, click on the table name on the left for: admin_activity_log
Go to the field:
admin_id
Click the Edit ...
And change the settings for this field to:
Type: INT
Length: 11
That will fix the current problem and stop it from happening ...
As to upgrading your site, there are a number of threads on how to do test upgrades first in a test directory such as /new_shop with a test database ...
Do a search on /new_shop and you should find many of these to spell out how to do a careful upgrade of your site ...
NOTE: v1.3.x has a new template structure ... in most cases you will need to redo your template ...
Linda McGrath
If you have to think ... you haven't been zenned ...
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