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For z1 compact.
Which driver - Fastboot, Flashmode or normal running driver?
I installed the drivers for the Z1 Compact from FlashTool Drivers Pack, with windows in disable the Driver Signature Enforcement. But the result is that I can not repair my cell phone via PC Companion or by FlashTool in Windows 10.
The problem is Microsoft and the inability to driver sign which is causing the issue - You could try running the program in compatibility mode
The Sony PC Companion stop in that point:
That's a Flashdriver issue - I've nothing to suggest to get it working - If the drivers are installed but not been assigning to the device then that's usually a Microsoft - Not sure if Driver signing can be disabled and if it can will be of any help