Can't Update CCleaner Pro

[Dubarnik]

When I click update I get this:

CCleaner could not be updated.

0x2efd: A connection with the server could not be established.

The third line gives me blue buttons to Purchase, Register, Cancel.

I re-registered using the emailed information from Piriform but still get the message.

I cleaned my computer, uninstalled CCleaner, reinstalled Pro but still get the message.

I have a Windows 10 machine.

Help, please.

 

[mta]

uninstall your current version first.
then go into the Program Files folder for CC and delete its contents
    (keep the .ini file if you have customised settings)
download the latest build from here; https://www.piriform.com/ccleaner/builds (or use FileHippo for previous versions)
reboot the PC then install CC from your downloaded file.
if you need to convert this Free version to the Pro, go to Options > About and enter your license key.

if no luck, try the install with the PC in Safe Mode.

if still no luck, and since you are paying for support, try these links; https://support.piriform.com/hc/en-us/requests/new or email them at support@piriform.com