To comply with GDPR we will not store any personally identifiable information from you. Therefore we will serve sub-optimal experience where some features such as Login/Signup are disabled. However, you will be able to search and see all the properties, see agent contact details and contact them offline on your own.
Once you have exercised the Option, neither buyer nor seller can back out based on their own will. Check with your salesperson, they should be able to advise you further.