In my program I have checked about updates and it sends me to a website called Banktivity.com which is where I can download a new program called Banktivity that says it is compatible with Big Sur and newer Apple products. This is not the same place I got my iBank program from. I got it through the Apple App Store. I am very old school and when it comes to a program that involves all my finances I am very untrusting of downloading things from unknown sources. Irrational perhaps.
Since a program called iBank seems to no longer exist, if I have to get a newer program how would you suggest I can be sure of the security?