Problems reactivating Studio 2017 and Multiterm

Trying to activate SDL Trados Studio 2017 Freelance (and Multiterm) after not having used it for a while. License still valid and active. As per chat instructions, I have downloaded the installers for Studio and Multiterm. Instead of activating Studio, I get the error message «Activation has failed. Impossible to connect with the activation server. Please check the address of the activation server in the supplier's parameters. The request was abandoned: impossible to create a secure SSL/STL channel.» (loosely translated from French). Also, Multiterm cannot install. Error message says that a more recent version is present. On all accounts, activation fails with both. 

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