Having great difficulties installing Xcode 4.2.1(70)

Early 2011 iMac. Lion 10.7.3. 650GB free 12Gigs RAM.

Checked permissions and repaired disk via the 'Repair Partion ' (which requires a reboot - so did that too.)

3/25/12 11:50:01.167 AM com.apple.SecurityServer: Failed to authorize right 'system.install.software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/in stalld' [934] for authorization created by '/Applications/App Store.app' [921]

3/25/12 11:52:33.877 AM authorizationhost: SFBuiltinEntitled: Install Xcode.app is not entitled for com.apple.ServiceManagement.daemons.modify

3/25/12 11:52:38.967 AM authorizationhost: SFBuiltinEntitled: Install Xcode.app is not entitled for com.apple.ServiceManagement.daemons.modify

3/25/12 11:52:38.968 AM launchdadd: FAILURE: Job com.apple.dt.InstallXcodeHelper is not loaded in launchd.

3/25/12 11:52:39.016 AM authorizationhost: SFBuiltinEntitled: Install Xcode.app is not entitled for com.apple.ServiceManagement.daemons.modify

3/25/12 11:52:42.588 AM installer: IFJS: *** exception: ReferenceError: Can't find variable: SDKPresent

3/25/12 11:52:42.654 AM installer: IFJS: *** exception: ReferenceError: Can't find variable: SDKPresent

3/25/12 11:52:42.938 AM Install Xcode: CLI installer : installer: Package name is Xcode

3/25/12 11:52:42.944 AM Install Xcode: CLI installer : installer: Upgrading at base path /

3/25/12 11:52:43.964 AM Install Xcode: CLI installer : installer:PHASE:Preparing for installation…

3/25/12 11:52:44.403 AM installer: Configuring volume "MacHD"

3/25/12 11:52:44.403 AM Install Xcode: CLI installer : installer:PHASE:Preparing the disk…

3/25/12 11:52:44.417 AM installer: Free space on "MacHD": 681.36 GB (681359142912 bytes).

3/25/12 11:52:44.417 AM installer: Create temporary directory "/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T//Install.9778vZWPb"

3/25/12 11:52:44.424 AM installer: IFPKInstallElement (29 packages)

3/25/12 11:52:44.426 AM Install Xcode: CLI installer : installer:PHASE:Preparing Xcode…

3/25/12 11:52:44.580 AM installer: Failed install preflight: Error Domain=PKInstallErrorDomain Code=102 "The package “DeveloperTools.pkg” is untrusted." UserInfo=0x7fbadb4cda70 {NSLocalizedDescription=The package “DeveloperTools.pkg” is untrusted., NSURL=../Packages/DeveloperTools.pkg -- file://localhost/Applications/Install%20Xcode.app/Contents/Resources/Xcode.mpkg /, PKInstallPackageIdentifier=com.apple.pkg.DeveloperToolsLeo, NSUnderlyingError=0x7fbadb4b8830 "The operation couldn’t be completed. CSSMERR_TP_CERT_EXPIRED"}

3/25/12 11:52:44.590 AM installer: Install failed: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.

3/25/12 11:52:44.592 AM Install Xcode: CLI installer : installer: The upgrade failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.)

3/25/12 11:52:45.747 AM authorizationhost: SFBuiltinEntitled: Install Xcode.app is not entitled for com.apple.ServiceManagement.daemons.modify

ALSO, I cannot redownload from the App store either.

The TP_CERT_EXPIRED entry is odd to say the leasts.