Hi Samuel Lee,
Welcome to sgForum's BVE Forum! Although i'm not a moderator
here, I can still answer all of your questions you asked.
OpenBVE
working on other PCs.
Hmm. Actually, OpenBVE works on almost all versions of Windows.
Including Windows 7. And, nope. You can't run OpenBVE on a Mac OS
and a Linux OS yet.
OpenBVE or
BVE?
Currently, we are focusing on OpenBVE. If you check out the
trains posted in one of the topics, you can see they have pictures
of the exterior. Which means it's related to OpenBVE.
Download
scattered?
Oh. If you find it troublesome to find trains, ( Actually, the
posts are all in one page.
) You can visit my
post 'BVE
Download Server' or willis_chong's post 'Singapore Routes and
Trains' which is a sticky.
Suggestions
for newcomers!
Sorry. But, could you be ermm, more specific? I can't really
understand you. ( No offensive! )
Zodurus. 
Thanks for the answer. So I will calrify that for new comers who
want to design another part of the route (Be it Sengkang LRT or Yio
Chu Kang - Bishan [All Without scenes] etc) what should be
done?
Just a feedback to CGA - XPO route. So can I drive the train back
to CGA after it reaches XPO, i want to take another side of view
(Like TO walking to other end of cabin)