Paypal setup

[egghed]

Hello
I should first say I have ordered the book but am meanwhile tinkering :) I am a complete non coding novice who is trying to set up a site where all the products are to be download only. To begin with I would like all payments to go through paypal only, so I have followed instructions and amazingly have gotten pretty far along the line. However, I've hit a stumbling block and I'm 100% sure it is down to my inexperience setting up my shop.

I have 2 questions related to this (or possibly 3!)

1) how would I remove the checkout button and move the 'Checkout with Paypal' button to its position so that Paypal is the only way to pay.

sample screen:



2) I fear this will tax my brain a lot more and indeed I fear tax is the root of the problem. I think I've set up UK tax OK, it seems to add the tax to the final total fine. I hit the Paypal checkout button, sign in at Paypal, where I'm presented with a summary screen and a 'Review Payment' button. I hit the review payment button and get these errors (I have replaced server username and address names with 'xxxxx'):

Warning: reset(): Passed variable is not an array or object in /home/users/xxxxx/html/xxxxx/shop/includes/modules/order_total/ot_tax.php on line 38

Warning: Variable passed to each() is not an array or object in /home/users/xxxxx/html/xxxxx/shop/includes/modules/order_total/ot_tax.php on line 39

Warning: Cannot modify header information - headers already sent by (output started at /home/users/xxxxx/html/xxxxx/shop/includes/modules/order_total/ot_tax.php:38) in /home/users/xxxxx/html/xxxxx/shop/includes/functions/functions_general.php on line 44

I would very much appreciate it if someone could help me translate the errors into something I might understand/learn about and fix.
Very much appreciated, TIA.

Oh, the possible third question was also related to tax. Since the products will be download only, that would mean customers could potentially come from anywhere in the world. How would one go about setting up tax correctly for that little nightmare? :)
Appreciated once more.

Egghed

[egghed]

Oh my, sincerest apologies. I missed the June 17th patch a few posts down! That is now installed and working. Thank you. I will continue to trawl to see if I can get any info on the other points.
Egghed

Edit
There is however another issue. The payment through Paypal was successful. I was returned to the shop successfully and confirmed payment to be presented with the download link. But now stuffit expander reports that the downloaded file 'does not appear to be compressed or encoded' and cannot open it. When I tested the same file as a free download it worked fine. How would the trip to Paypal and back have effected the file?
Thank you
Egg