Importing Postman Collections throws an exception

When we make use of the “Import Postman Collection” menu, it results in an error:

We tried to follow the advice on the forum at: Solved: error when importing a postman collection - Page 2 - SmartBear Community but it seems there is no longer the option in Postman to export collections as V1.

Exporting to V1 from Postman seemed to have been deprecated in 2018.