4.15 Upgrade Aborting - Cannot Perform Upgrage

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After uploading 4.15 and go to the upgrade page to upgrade from 4.14 PL2, I receive this:

Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0

Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0

Fatal error: Unknown: Failed opening required 'google_verify.php' (include_path='.:') in Unknown on line 0

Then if I enter my customer number and start the upgrade, I receive this:

Unexpected Text:
<?xml version="1.0" encoding="windows-1252"?>
<upgrade>
<message replace="0">Creating apipost table</message>
<status>Status: Processing 4.1.5 Beta 1, Step 2 of 2</status>
<longversion>4.1.5 Beta 1</longversion>
<version>415b1</version>
<nextstep>2</nextstep>
<upgradenotice><![CDATA[<strong>Upgrading to 4.1.5 Beta 1</strong>]]></upgradenotice>
</upgrade>
<br />
<b>Warning</b>: Unknown: failed to open stream: No such file or directory in <b>Unknown</b> on line <b>0</b><br />
<br />
<b>Warning</b>: Unknown: failed to open stream: No such file or directory in <b>Unknown</b> on line <b>0</b><br />
<br />
<b>Fatal error</b>: Unknown: Failed opening required 'google_verify.php' (include_path='.:') in <b>Unknown</b> on line <b>0</b><br />

I have downloaded, unzipped and FTP'd the files twice; same result each time.

Assistance appreciated.

Thank you in advance