Hi David,
I'm using English and in most respects the install is pretty vanilla. I'm also using a version of UD+ that I downloaded from this site today, so I assume it's current.
The first point I raised is just about language confusion. The problem with the 'admin address' description in your plugin text is that there is a generic e-mail address for the site as a whole, which is entered in the site's general settings screen, but also at least one admin account (user account) that has an email address, which may be different. Meaning the word 'admin' itself is actually used in two different ways by Wordpress, which is what tripped me up.
Your text references the email address entered on the General Settings page for the site, and you can see where the confusion comes in on that page because the explanation underneath that blank says: 'This address is used for admin purposes, like new user notification.' In that instance 'admin' means administering the site, not being logged in AS the/an admin.
The second point, about the confused link, occurs in this text on the plugin settings page:
Your site's admin email address (admin@example.com) will be used. For more options, use the "Reporting" add-on. Be aware that mail servers tend to have size limits; typically around 10-20 Mb; backups larger than any limits will likely not arrive.
Here's the page source:
<tr class="updraftplusmethod email">
<th>Note:</th>
<td>Your site's admin email address (admin@example.com) will be used. <a href="http://updraftplus.com/shop/reporting/">For more options, use the "Reporting" add-on.</a> Be aware that mail servers tend to have size limits; typically around 10-20 Mb; backups larger than any limits will likely not arrive. </td>
</tr>When I float my mouse over the UpdraftPlus link in the above text, I see this (which I copied and pasted here):
http://www.example.com/wordpress/wp-admin/%22http://updraftplus.com/shop/reporting/%22
I have no idea why, but that's what I see (although %22 displays as "), and if I click that link I get a 404 on my own site.
Thanks for following up.