Which version of Crystal Reports should I use?

SAP Crystal Reports 2020 is what should be used - SAP Crystal Reports | Business Intelligence Reporting Tools

You can download a trial version, and you have 30 days to confirm it works for them before committing to a purchase.

However, please bear in mind that Jiwa uses version 13.0.31.4010, the SAP Crystal Reports runtime engine for .NET Framework (64-bit). If you have the latest CR 2020 installed as well as the version Jiwa uses, you will get clashes and errors.