Try the 2.0.4 alpha

Author: QuLogic

.appveyor.yml

@@ -46,7 +46,7 @@ cache:
 init:
   - ps:
       Invoke-Webrequest
-      -URI https://micro.mamba.pm/api/micromamba/win-64/latest
+      -URI https://github.com/mamba-org/micromamba-releases/releases/download/2.0.4alpha3-0/micromamba-win-64.tar.bz2
       -OutFile C:\projects\micromamba.tar.bz2
   - ps: C:\PROGRA~1\7-Zip\7z.exe x C:\projects\micromamba.tar.bz2 -aoa -oC:\projects\
   - ps: C:\PROGRA~1\7-Zip\7z.exe x C:\projects\micromamba.tar -ttar -aoa -oC:\projects\