UPDATE: Version 1.3 which is currently available as a beta, addresses this issue and also introduces a simplified and stable registration platform apart from other features/enhancements.
Download the upgrade here (64-bit):http://auto.designspark.info/dse_exe/DesignSparkElectrical_v1.3_Beta.exe
All versions are available on the main website: https://www.rs-online.com/designspark/electrical-download-and-installation
Full changelog here: https://designspark.zendesk.com/hc/en-us/articles/360002671034
We apologise that you have experienced this error. It is due to a bug which we are working to resolve. In the meantime we can suggest a possible solution. The bug means that the registration process cannot tolerate any double byte or special characters. This includes "&" for example, and also any Chinese or Japanese characters. If you can complete all of the registration fields using only European letters and numbers this should solve the problem.