Dear Invoiceninja Support,
The current SSL Certificate for the domain: app.invoiceninja.com | 526: Invalid SSL certificate
is invalid.
Can you give me an information when the site will be up again?
We will be updating to version 5 after this.
+1 for me too. Trying to buy a new license, but CloudFlare is blocking with the above message.
Hi,
Sorry for the trouble, we’re working to resolve the issue.
You can temporarily use this link to workaround the problem.
https://webapp-3.invoiceninja.com
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Hi @hillel, FYI this doesn’t resolve the license purchase issue. I’ll await your notification of the final fix 
This link should work to purchase a license:
https://webapp-3.invoiceninja.com/buy_now/?account_key=AsFmBAeLXF0IKf7tmi0eiyZfmWW9hxMT&product_id=3
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Ok, this hopefully should be resolved soon.
The issue is now resolved, very sorry for the inconvenience!