QUESTION: Fix punctuation: Once you have downloaded the program you have a 30 day trial period
ANS: Once you have downloaded the program you have a 30 day trial period.

QUESTION: Fix punctuation: The rotational speed of the blade up to about 13500 Min
ANS: The rotational speed of the blade up to about 13,500. / Min

QUESTION: Fix punctuation: The White Rose will always be good Returning to the bouquets with a complex composition which aim to achieve the expected decorative effect we must remember that to achieve such an effect is possible only under the right color combinations matches the color of their harmony
ANS: The White Rose will always be good. Returning to the bouquets with a complex composition, which aim to achieve the expected decorative effect, we must remember that to achieve such an effect is possible only under the right color combinations matches the color of their harmony.

QUESTION: Fix punctuation: Our employees have contributed to define an entire industry
ANS:
Our employees have contributed to define an entire industry.