15.3 The Parties expressly exclude the applicability of the Vienna Convention on Contracts for the International Sale of Goods to contractual relationships established by the Purchase Contract under these Terms and Conditions.</li> <li>15.4 Invalidity or ineffectiveness of a provision of these Terms and Conditions shall in no way prejudice the validity and effectiveness of other provisions.</li> <li>15.5 The valid and effective version of these Terms and Conditions is always available at: https://shop.prusa3d.com/en/content/3-terms-and-conditions-of-use.</li> <li>15.6 This version of the Terms and Conditions is valid and effective from 01.09.2020 and replaces all previous versions of the Gernal Terms and Conditions, including their other parts.</li> <li>