If you previously purchased a license, you are eligible for free registration keys for new versions (like 1.8) for up to 8 years from your purchase date. Key Update Tool: Existing users can use the Chemcraft Update Page
Regarding the registration key for Chemcraft 1.8, I must clarify that: Chemcraft 1.8 Registration Key
Chemcraft is a commercial product. To use it beyond the trial period, you must obtain a legitimate registration key from the developer. Free 8-Year Upgrades: If you previously purchased a license, you are