Account & license
Activate a code
Use the Account tab to confirm your email and activate third-party order codes.
On first launch, only the Account tab is active. Enter your email, send a single-use confirmation code, paste it once, and then use the Activation Code field for third party vendor purchases such as SimMarket.
Start from the Account tab
Open CSS Launcher from the Desktop or Start Menu shortcut. Until account setup is complete, only the Account tab is active.
Confirm your email
Enter your email address and press Send. A single-use confirmation code is sent to that email address. Paste it into the Confirmation Code field and press Enter.
Activate third-party purchases
After the Store, Library, and Support tabs become active, enter the Activation Code from a third-party vendor order in the Activation Code field.
Related articles
Continue through the launcher workflow or jump to the next support step.
Need support?
Collect the article context and logs first, then open support.
Source: CSS Launcher User Manual, Rev. 5 — December 2025.