Trying to use .NET assembly gives 0x80131515 error

[Vince|Dyalog]

If you get an error message like this:

Assembly load failed:
Could not load file or assembly 'file:///C:\Program [^] Files\Dyalog\Dyalog APL-64 17.0 Unicode\sharpplot.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)


Try this:
1) Right click on the Assembly and choose Properties. Press the unblock button.

2) Use notepad or some other text editor to create a text dyalog.exe.config file in the same directory as dyalog.exe.

a) Right click on the shortcut which starts it and choose "Run as administrator". (This is necessary to write into a directory under C:\Program Files\ and to avoid UAC Virtualization).

b) Insert the following contents:
<configuration>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0"/>
</startup>
<runtime>
<NetFx40_LegacySecurityPolicy enabled="true"/>
</runtime>
</configuration>