A million congrats.. great job!
I have a little problem though and this is the first version I have it.. in the taskbar I got the message that b4a is not downloaded and
that it could harm your computer.. what should I do to download it.. Un-install ant-virus then install it back?
Sure you can install B4A V4.0 in another folder and use several versions without any problem.
I always save a new version in a new folder and keep some 'older' versions. Don't forget to copy the license file to the new folder.