Sometimes, the Windows 10 upgrade installer blocks 1903 upgrade attempts. As reported in the Windows 10 Known Issues list on August 1, users running Intel RST version 18.104.22.1682 through 22.214.171.1243 will get a message from the Installer (see following graphic) that tells them to upgrade to version 126.96.36.1994 or newer (today’s current version is 188.8.131.521, dated July 10, 2019 as I write this blog post). According to the MS remediation info, version 184.108.40.2064 is recommended for affected devices. But in certain cases, Intel RST stymies 1903 upgrade once the new driver is installed! Fortunately, there’s an easy fix should that happen.
Sometimes, this error recurs after an IRST driver update.
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If Intel RST Stymies 1903 Upgrade After Current Driver Installed, Do This!
Thanks to alert and savvy users on TenForums, I learned about this problem and its fix at the same time. As documented in the thread entitled “I updated RST drivers, still get the 1903 error,” user Rafaboss explains that deleting or renaming the old driver version named iastora.sys (he suggests iastora-old.sys) will let users take advantage of the “fix” button that the upgrade installer now presents for 1903 when something goes wrong on a previous install attempt. The target directory for this operation is the default Drivers directory (C:\Windows\System32\drivers). Other users correctly observe that you can use the Open Source DriverStore Explorer (RAPR.exe) tool to do the same thing. Either approach will do the trick, and allow the 1903 Upgrade Installer to proceed to a successful completion.
Thus, there’s no need to stay stymied, if Intel RST stymies 1903 upgrade on any of your PCs. ‘Nuff said!