Backup 7, (ERR 2006

I have two servers, with SQL Backup 7.0.0.597. Each has this issue.

I open SQL Backup GUI client. Right-click on server name, select RESTORE. I do drop-down combo box, select BROWSE FOR FILE, then click the ADD FILES... button. I get an error box

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Object reference not set to an instance of an object.

[chk-box] Ignore this error and attempt to continue.

[Send Error Rpt] button
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ERR 2006: Could not load file or assembly 'System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.
The system cannot file the file specified @ 0x0011)

Preparing the error report (ERR 2006: WriteStart Document needs to be the first call @ 0x0011)

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I have tried the "ignore" check box, no difference.

I have done a few "send to RedGate"

Windows 8, SvcPk 2

SQL 2008R2