Mine just installed as 64-bit Graechan; not sure if there is an option in custom install for yea or nay since I really didn't pay attention to that. There may not be an option; if you have a 64-bit OS this you will have a 64-bit install. If you indeed have a 64-bit OS and it installed as a 32-bit OS, then I have no answer for you.

Not for long. I should be ready soon with the regular and portable versions.

That's why. You already had a 2.8 folder.
It didn't need to copy the gimp-2.6 folder.

Weird how it kept your Gimp-2.0 install though.
I chose custom install though also so maybe that is the difference.
I did however install it to its default location Gimp-2.

Will you have 64-bit versions of 2.8 as well?

Of course.

That's great news Partha and thank you!

I think they did that so no conflicts with any ver changes of libraries that each version might use .

Yes except that
1 there is not any need to do that in case of gimp (because even in the no portable version the libraries are self contained)
2 try to import addon from previous version (as far i understand the installer does that) not only nullify the utility of the unistall BUT
may be well cause of a lot of conflicts and silly warnings

I must admit i didn't personally check if the 2.8 installer still try (as the previous for the 2.8rc) to import for older version, but for sure point 1 seems sufficent

All my older plug-ins work in Gimp-2.8 and i didn't remember to check for that either PC. So it must just work out of the box or maybe when you select customize it auto checks everything for you.