I can not make any purchase because of this ¬¬

Yes I have also had similar issue, thought it was just me. I just keep hitting checkout until it goes through, usually takes 3 or 4 tries.

Yeah I had this issue to. I just closed it out and tried it again and it worked. Maybe an issue when things get busy???

Okay this is getting annoying now... it won't work at all.

I´m refreshing the page for an hour already and nothing is happening. Seems like PayPal doesn´t work with GOG for some users.

I also experienced this. Was caught in a loop, screenshots attached. Waiting 20 minutes helped once. The other time I couldn't pay for a game through Paypal directly, I recharged my GOG Wallet (still using PayPal) and bought the game using that. Could have been coincidence or luck, but maybe it's worth a try for some of you. I also emailed support the first time I ran into this error(I hadn't made screenshots back then) and they explained that they would investigate this issue further, though it would appear to them like my bank prevented the transaction in the first place. There isn't anything in this sale for me that's a must have right now, so I don't really care anymore.

But good luck to whom is still invested this sale, regardless.

Midoryu
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“Believe those who are seeking the truth. Doubt those who find it.”
André Gide(1869-1951), French author

Edited an hour later: charged -> recharged

I'm having the same problem when using a VPN. When using my ISP I get through eventually, but it's slower than it used to be.