Several posts explain that WOOCS doesn’t work 
- YITH Multi Currency Switcher for WooCommerce - General - HivePress Community
- Integration with Woocommerce Currency Switcher - General - HivePress Community
- Incompatibility with the WOOCS plugin - General - HivePress Community
When you need to sell item or service through different countries it is a big issue. and more it an essential feature, a key one for a marketplace.
How to have someone working on this item?
You’ve said that you have test différents solution but we haven’t had your feedback.
I purchased the market place plugin and this is the last feature I need to fix to launch my website?