Last heard, 64-bit versions were being phased in.
On an NCH download page, one link leads to https://www.nchsoftware.com/download/videopadsetup64.exe
Click MENU (top-left) HELP | ABOUT to see which is installed.
For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info. There's no mandate to upgrade and newer releases can always be test driven, whether licensed or not.