Tex. Prop. Code § 221.023

The developer shall file amendments to the registration reporting to the commission any materially adverse change in any document contained in the registration not later than the 30th day after the date the developer knows or reasonably should know of the change. The developer may continue to offer and dispose of timeshare interests under the existing registration pending review of the amendments by the commission if the materially adverse change is disclosed to prospective purchasers.