TIP if you're having trouble with redemption:
NOTE: After installing the plugin in the Chrome browser, when I entered the license key (redemption code from Appsumo) into Blurweb.ap, I kept getting an error message saying the license code was incorrect. The license key consists of four alphanumeric fields (Example: 1F78PQ16-2154550B-AJSDHJE5-15MHKD54). Unusually, a series of ,,,, (Example: -15MHKD54,,,,) was appended to the end of the last license code block, which apparently does not belong there for activation.

I deleted these ,,,, from the key, and then the activation worked without any problems!!
So: Copy the key from Appsumo, enter it in the app’s license field, and then delete the ,,,, at the end of the code!
Hope this works for future users as well.
Five ***** so people will read this, not because of the complicated activation process.