Revert previous - and try forcing conan 1. (#706)

appveyor.yml

@@ -3,6 +3,9 @@ image: Visual Studio 2019
 
 version: '{build}'
 
+environment:
+  matrix:
+    - CONAN_VERSION: "1.62.0"
 install:
     # Set up Visual Studio build environment, 32-bit output with a 64-bit builder
     # > Increment version number when newer version of Visual Studio supported by Appveyor
@@ -29,6 +32,7 @@ install:
         $env:PATH += ";$pythonCmdOutput"
     # Specifically use Python 3's "pip" to install Conan
     - cmd: py.exe -3 -m pip install conan
+    - cmd: conan user # Create conan data directory
     - cmd: conan --version
     - cmd: choco install doxygen.install