You can download 4.3 desktop manager and 4.2 OS from Telus,
LINK TO DESKTOP MANAGER:
... RIM Blackberry 87xx forum
Re: 4.2 for sprint
DCookSta's mentioned this several times already but it sounds like you haven't installed the 4.2 OS for the BB on your PC. You need to run it so it can decompress your BB's system files to your PC's hard drive or else it can't perform the upgrade and there won't be a vendor.xml to delete. You can always use Windows Search to find vendor.xml.
Originally Posted by cpernell1
When you go to delete vendor.xml make sure you close DM, delete vendor.xml and then re-open Desktop Manager.
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