My key wil not working

Could it be the same issue as described here?
regularlabs.com/forum/extensionmanager/5...-download-key#105393

Can you give me (super) admin and (s)ftp access so I can take a look?
You can use the 'Confidential information' button in the forum editor to hide sensitive information.

The FTP won't let me connect...

Nope, it keeps asking me for the password and doesn't accept it.

Sorry, but I can't do much for you like this.

It tries to connect. Seems the credentials are ok. But it now just times out. Stuck in 'connecting'.

Finally got in. THe password in your last reply was missing the last character.

Please try the latest development version of the Regular Labs Extension Manager from:
regularlabs.com/development-releases

Should be fixed now with latest dev release.

The reason the checks were failing is that for some reason your server is adding whitespace (a newline) to the results of URL calls.
This caused the json results to contain invalid characters.
I have added code to strip that extra whitespace before handling the results.

If you run into other issues (also from other 3rd party extensions) concerning javascript ajax calls, then that could well be due to this issue caused by your server.
I have no idea what exactly is responsible for adding that whitespace.