Thunderbolt firmware update 1.2 won't install

I can't find a way to get Thunderbolt firmware update 1.2 installed. I need this update because my external display won't work without it. Machine is late 2011 13" Macbook Pro running OS X 10.9.5. Other updates install without problems, only this update is keeping coming back. Installation seems to go fine, however it doesn't actually install it and update re-appears to App store.
Stuff I've tried already
Install update on AC & fully charged battery
Download & install update manually from Apple website
Install update with & without thunderbolt connected
...with these combinations, App store update log shows 8 installs for that update (and it's still not actually installed)
Anyone had similar problems? Any ideas how to get it installed?

Restart the computer in safe mode. Certain caches maintained by the system will be rebuilt.
Safe mode is much slower to start up than normal. The next normal startup may also be somewhat slow.
When the login screen appears, restart as usual (not in safe mode) and test. There's no need to log in while in safe mode.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t start in safe mode. In that case, ask for instructions.

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