Fatal error: Class 'ZipArchive' not found

ok I see that on your server

Native ZIP Enabled No

this could be the issue
please try on another host or localhost to see if it works for you
then I have found another issue on your website, the JSON strings are not correclty managed then the styles won't apply and no template can be made. I think that this is related to a specific server param too, but I don't kno which for now.
CEd

I did notice the Native Zip but the pkg_templatecreatorck_2.1.11_j30.zip was working perfectly for over a week until it stopped with errors today!?

Ok, that's a good news
Have you asked your host provider to see if they changed something on the server settings ? Or may be you have changed or added something ?

by my side I reprocude a part of the issue by enabling "magic quotes gpc", then I get the same error "Warning: Invalid argument supplied for foreach()"
but this magic quotes are not enabled on your system.

I have to say that I don't know exactly where is the problem but for sure it is related to the server. And I wonder why suddnely it stops working.

I don't know if it is relevant I put a php.ini file in the administrator/ folder as follows:

magic_quotes_gpc = Off
session.save_path = "/tmp"
; Maximum allowed size for uploaded files.
upload_max_filesize = 20M
post_max_size = 20M
upload_tmp_dir = "/home/hidescom/public_html/tmp"

Also I checked one of my other sites yesterday with the same hosting company and Native ZIP was Enabled but now when I check it again today it is Disabled.

and if you remove this file, does it work ?

in my mind template creator is not in cause as you have tested it and it was working. You should find where is the problem on your server ...