Perfect, I did it, thank you very much.
Yes, it is not working. No clue why. Tested it on PC and phone, Firefox and Chrome.
Working OK here
It won't help me, I am afraid. 
My tip: Use a git compatible platform to publish your work.
No, working here with Firefox / Chrome.
Still not here.
Since there is no alternative, I must skip this extension.
Working here on mobile, laptop and PC with Chrome.
Thank you all very much telling me it works for you. On no platform, nor on any browser, I get a result. I have no clue why. When you can give me an alternative, that would really help me.
Seems the issue of reaching Kevin's web site lies with your firewall (router?) / network / dns setup. This falls outside the remit of this community. You need to fix whatever it is that is preventing you from accessing this site. You should find plenty of help on the interweb....
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Thanks, but that is too much trouble for 1 extension. I skip this.
Update: Mystery solved. Stopping the VPN connection made it work.
Use a VPN to access that site
Taifun
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I also have no problem visiting the website with my mobile devices and downloading the extension, neither with WiFi nor with LTE.
Btw, I would be interested to know which (error) message appears.
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Mystery solved by stopping the VPN.
There was no error at all, just an empty screen.
What do you mean 2 windows? Show your blocks or demo aia.
I have 2 screens, on the first everything goes well, on the second screen I call the tinyDB of the photo lists and it generates the buttons, but when I press a button it returns me to screen 1, I return to screen 2, and When I try again, the error appears.
post a demo aia please.