will photoshop work again?

i had a free downloaded version of adobe photoshop cs2 but its 30-minute trial expired. i tried uninstalling it and then downloading another one and installed it again but that didn't work. so i thought of using an adobe photoshop updater.
Guide questions:
Q1: if i use the updater, will it turn into cs3 or cs5?
Q2: if it updates, will i be able to use it again or is it still expired?
Q3: are the features in adobe photoshop cs2 also available in cs3?
Q4: are the features in adobe photoshop cs2 also available in cs5?
Q5: what if i'll just download another version of adobe photoshop?
BonusQ: a. why is it that some sites offer 30-day trial and some only 30-min? b. which sites offer 30-day trials? and c. why is it that some sites download for less than an hour but in a site (called brothersoft) it takes about 3 hours?
NOTE: you can answer the guide questions if you want or leave it blank if you can give some other answer :)
 
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