Moving back from 1.4 to 1.3.7

[skpg]

1.4 guest purchase, one page check out are great.
But it seems have some problems for me.
in one page checkout and guest purchase, got error message
something like that:

TECHNICAL ERROR: unable to send login informations
Error thrown: [object XMLHttpRequest]

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and new themes are needed to use all new function, right? at least my Earth theme cannot fit 1.4 and the alt theme also need deep modification before use.

seems this is not good for production use yet, I am going back to 1.3.7 version with my beautiful theme.

and the paypal module is great in 1.4 ; but after I setup all settings, it always give me warning to activate the Paypal intergral? Sorry I don't want this. I just want simple Paypal + express checkout is enough.