Download problem on my ipad and/or other device. such as tablets. What should I do?

Yes, the Digital Download should work on all devices, and also Mac and PC computers.  However, we do recommend downloading it your computer first, then transferring it to your device.  See below for more info:

https://lightbody-inc.helpscoutdocs.com/article/44-download-help

Note: Due to the countless variables that we cannot control associated with individual computer systems/versions/software & software updates, we are unable to provide you with direct support on how to setup any download on your personal computers or devices. 

However, generally speaking, if you want to watch on your smart  device, you may first need to save the file to your computer.  Next, right click on the file you have just saved, select "Open With"  and choose your preferred application (usually iTunes or Windows Media  Player). From here you can sync to your iPod/iPad/iPhone with your  iTunes program, or to your android phone/tablet with your Windows Media  program.