I ended up just going with the creative cloud installer - which is very nice! It installed Flash Builder 4.7 and then it was the trial version - so the next time I opened it it gave an option to add a serial number - which I did and that worked. So I think we are good!
The thing about the government network that I'm on... Creative Cloud is not an option. Our environment doesn't allow for that and the one place that I found that at least used link to the direct downloads that Adobe used to offer... they're all shutdown now. It's causing me quite the point of frustration.
No your assumptions are not correct, To install Flash Builder why we have to install Creative Cloud that too it is very slow and one more thing it is doing downloading and installin at a time it is also not good. we will download one time and will install some other time. every time we no need to download it is wasting a lot of time.
Two points to remember
1. Creative Cloud is a WORST option
2. Installing while downloading not good option that too such a big file