Yeah , its happened to a few of us , there is another thread but basically what you need to do is rollback to 1.71 the re-install the update .if you have any customised models stored click on no if it asks if you want to keep them DONT touch the guitar during the install , in fact dont even look at it and dont run any other programs when the install is running so theres less chance of it timing out due to background programs slowing it down and finally recite the whole of Led Zepplin's Kashmir backwards half a dozen times . It took me 3 attempts which seems the norm .

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