Q1 OPEN SSHを使う設定にすると
System.Exception: Unable to to start 'C:\Users\h.yoshikawa\AppData\Local\Atlassian\SourceTree\git_local\bin\ssh-agent.exe' check the git installation.()
Looks like SourceTree is looking for ssh on Git Embedded while you are using a System Git. For testing purposes, can you try to change for Embedded Git? You can do this going to SourceTree Menu -> Preferences - Git.
Your issue looks very similar from this answer I've replied sometime ago: https://answers.atlassian.com/questions/32519165
Another factor that might causing this issue is some antivirus or firewall blocking the ssh-agent. Please check this as well.
In case you still face issues, please feel free to raise a ticket with SourceTree Support: https://support.atlassian.com/servicedesk/customer/portal/1
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