How to solve the invalid signature in CAD20 17?

Try it first, and you can't do it any more.

(1) You can open a CAD drawing or CAD.

② Click the right mouse button in the blank space to pop up a shortcut dialog box, and click "Options".

③ Enter the main interface of "Options: Dialog Box" and click the "System" option in the main menu bar to enter the system setting dialog box.

④ Under the "System" column, click "executable file location" in the lower right corner.

⑤ In the Executable Location dialog box, under the Safe Load column, click the first "Load from all locations without warning", and then click OK.

⑥ Return to the "Options" main interface, click "Apply" first, and then click "OK" to close the options dialog box.