During our setup with Appveyor (CI) we noticed that Litium probably runs on older Nuget protocol 2 instead of latest 3.
This is mostly not an issue since it seems that Visual Studio works out of the box. But for Appveyor after few tries we had to manually define Nuget.Config with;
<add key="Litium" value="https://nuget.litium.com/nuget/" protocolVersion="2" />
Otherwise it would just time out/and not find the packages it was looking for.
Adding this here for documentation reasons to help others but also maybe you guys at Litium could look into this.
Litium version: 7.2.3