So, as ronyP replied in a different form: You probably have installed both, the paid and the free version. Deinstall the free version.
I went to my server with FTP to httpdocs/wp-content/plugins/woocommerce-jetpack and renamed woocommerce-jetpack.php to woocommerce-jetpack_bak.php
Then, I was able to access my site again and delete the plugin.
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