Recaptcha.Web.dll crashes - cannot find file assembly

[Ori4]

Recaptcha.Web.dll has been working beautifully for quite a while. Recently, it started crashing with this error:
Could not load file or assembly 'Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified.

After some investigation, I thought it is happening because my Windows installation has upgraded Newtonsoft.Json. So I thought I would rebuild Recaptcha.Web.dll using the upgraded Newtonsoft.Json, and the online source.

Now, I am getting this error:
Could not load file or assembly 'Newtonsoft.Json, Version=11.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified.

Help is most appreciated.

Ori

[tanveery]

@Ori4 Do you still have this issue?

[Ori4]

While the error is no longer happening (great!), I do not remember the steps I took to fix it - sorry.

[ncdaol]

I'm having this issue as well. It says it can't load version 12.0.0.0 if I use 13.* in my project.
12.* contains a serious vulnerability, so it's not an option to use the old version in the project.
https://www.ibm.com/support/pages/security-bulletin-vulnerability-newtonsoftjson-120122727dll-has-afftected-net-agent-0