From my little knowledge, the error "Error retrieving plan details. Please try again in a moment" typically occurs due to connectivity issues, server problems, or cached data conflicts. I can’t say it’s either of those though exactly without seeing the code.

@James Tuttle There are many in this same position right now. Many who need to ramp up there skills and need access to courses like 2.0 to level up but don’t have the funds to pay for the course.