I searched, but wasn't able to find anything, so forgive me if this has been answered already... I installed Visual Assist last week and started the trial. Tonight, when starting up Visual Studio, the 'Try' button is greyed out and it says the evaluation period has expired. Is the trial period different for the community edition of Visual Studio?
You must have installed Visual Assist to a PC that ran a 30-day trial previously. After an initial trial, new builds run in trial mode for only seven days.