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Stc-isp- 15xx-v6.86d win7 system cannot be installed. What should I do?
1. Open the running window with win+r, enter gpedit.msc command, and press Enter.

Enter gpedit.msc

2. In the open window, expand User Configuration-Management Template-System-Driver Installation in turn, and find and double-click "Device-Driven code signing" on the right.

Driver installation

3. In the pop-up interface, click Enable, select Warn when window detects driver files without digital signature, and then click OK.

Enable driver

4. Complete the above settings, restart the computer, and install it according to the prompts after booting.