We could not complete your purchase cancelled

Same issue here. I noticed something on Wednesday.

Tell them to check the various thread on these forums..not counting on other websites

I'm not going to reinstall : it's broken on their side

Apple needs to fix it!

They fixed it! I can now download Logic Pro again!

Yup, I can confirm!!!! Downloads work again

yay it's fixed!!!!!!!

I want to downgrade as im one macOS Catalina 10.15.5 beta

Its not working for me. Its not fixed.

I can confirm it’s all working for me too ! So pleased I didn’t update to Catalina in my darkest hour !

Works fine now, didn't have to do anything.

Great, now I hear this... I begrudgingly ended up upgrading to catalina to solve this yesterday. oh well..