Menu - Edit HTML Template...
If it's not there, you are not in Expert mode. Click on 'You are in Easy mode'
Latest version you get with 'Menu - Updates'. 'Auto check every day' keeps you on track.
Like living on the bleeding edge? Check 'Offer me to update from stable versions to unstable versions'; you'll get the (possibly) unstable test versions also.
@rejetto
I think the option for offering unstable test versions should be an expert setting...
MarkV