refering to page
in particular the following statement:http://www.amibroker.com/download.html
32-BIT OR 64-BIT?
If you are not sure what to choose - use 32-bit. 32-bit version works everywhere, on both 32-bit and 64-bit Windows.
64-bit version requires 64-bit Windows and has advantage of being able to use more than 4GB of RAM, for details see compatibility chart. If you have 64-bit Windows you can install and use both versions (in separate folders)
does the above implies that i can use both 32 bit and 64 bit installation with respective regkeys , with my license on a same machine ?