i rebooted my server as instructed. and uploaded another diag file.
this is in response to the same errors:
plugin: installing: community.applications.plg
Executing hook script: pre_plugin_checks
plugin: downloading: community.applications.plg ...
plugin: community.applications.plg download failure: Network failure
Executing hook script: post_plugin_checks
mmpc-diagnostics-20230401-0116.zip