Could not load file or assembly 'RestSharp, Version=105.2.3.0

I had the same issue, and I've finally found how to solve it.

The thing is: when you install Twilio through NuGet, it installs RestSharp as a dependency. BUT for some reason, the installed version of RestSharp is Version=105.2.2.0 (instead of Version=105.2.3.0, which Twilio seems to be looking for at runtime).

So how do you solve that?

1. Go to your installed NuGet packages
2. Select RestSharp
3. Update it to the version 105.2.3.0 (with the blue-arrow icon)

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Why the NuGet Twilio bundle installs RestSharp Version=105.2.2.0 and then at runtime looks for RestSharp Version=105.2.3.0? No idea.

1. Remove all references form Restsharp.

2. Clean Solution (Clean solution option)

3. Add RestSharpSigned.105.2.3 (find by name RestSharpSigned).

   it's work.

When you are adding a reference to RestSharp, be aware of the version number (Version=105.2.3.0).

Also, your project's .net framework should be higher or equal then the referenced dll's.