Thank you Daniel for the fast reply which unfortunately confirmed what I expected.
I have another VM with Windows Server 2012 R2. There is no issue and I used it around 15 years in the previous configuration without any issue. Now it's a bit complicated to maintain the SVN via the other VM but better than losing totally the functionality.
Last Question:
I used the TortoiseSVN command line tools for PhpStorm. Is there a way to install only the TortoiseSVN command line tools without the shell?
Thank you, Peter