In the case of a clean installation:
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1. Install Altium Designer 18 (x64).

2. Copy shfolder.dll to the folder where the executable is located: X2.EXE
usually here: C: Program Files Altium AD18

3. Launch the application and use the included “correct” licenses.
Naturally, you can generate / edit your licenses,
using attached as templates.

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If you already have your own “favorite” licenses,
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Fix them using a generator:
1. Load a license (Load ...).
You can simply drag the license file into the generator window.

2. Save the license (Export As ...)

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In case you need to remove the medicine:
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1. Close the application (AD).
2. Delete the crack: shfolder.dll


Enjoy!