Where can I download Banktivity/iBank for Mac? And which version of macOS is supported?

The latest version of Banktivity 7 can be downloaded using the following link:
Banktivity 7 (for use with macOS 10.13-10.15)

The following links can be used to download older versions of Banktivity/iBank for Mac:
Banktivity 6 (for use with macOS 10.12-10.14)
Banktivity 5 (for use with macOS 10.9-10.12)
iBank 5 (for use with OS X 10.8)
iBank 4 (for use with OS X 10.6-10.8)

You can also use the following links to download Banktivity/iBank Manuals:

Banktivity 7 Manual
Banktivity 6 Manual
Banktivity 5 Manual
iBank 4 Manual