Upgrade to Skype for Business failed. Error 1603

Have done several upgrades from Lync 2013 to Skype for Business 2015, so this last one should be no different, but faith had other plans.

Installed topology builder on a new computer and prepared the upgrade process. But when a bit into the upgrade it failed.

Error: Error returned while installing OcsCore.msi(Feature_LocalMgmtStore), code 1603. Error Message: A fatal error occurred during installation. For more details please consult log at C:\Users\paupav\AppData\Local\Temp\Add-OcsCore.msi-Feature_LocalMgmtStore-[2018_10_17][14_05_11].log

As most people know a MSI error of 1603 tells us as much as “An error occurred”. Tried do some reboots and retried, but nothing helped. With no idea of what could possibly be wrong, I was browsing for ideas or hints the usual places: Eventviewer, Windows explorer (free diskspace, files and folders), services, policies, and finally¬† windows update settings and history.¬† One clue (except that is was error 1603) there was 1 SfB update installed (probably because I selected the installer to check for updates). Thougt it was strange that there should be one update since I has not yet managed to install any SfB software.¬†

So simple. Uninstalled the update , rebooted and the upgrade from now on went flawless.

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