Richard Woodley, see my comment #3 or read this... the icon in bottom left corner of the window that has no tooltips is the save as icon, it allows you to specify the filetype by specifying the file extension I tried JPG and PNG types it might support other types but the compression is set to quality 100 on JPG and very poor zip compression for PNG. You don't HAVE to copy to clipboard but you can... not tested the copied data format if it's an uncompressed raster image including alpha layer or not... not worth the effort unless someone asks.
TK

David Bookbinder, could be your firewall blocking outbound internet connections, I was able to download additional filter packs with it. Try lowering your firewall profile to allow outbound connections by default.
TK

TK, No other software I use requires me to mess with my firewall protections default in order to work properly, nor do the vendor sites keep coming up with insecure connection messages. There appears to be a problem with your certificates.

David Bookbinder, Hi, your reply suggests the cause of the problem as there is nothing wrong with either the vendors site or the site it redirected to via a 301 error redirection even tested it on a vista machine with an ancient firefox based browser and the via a https requestor utility that use the systems ancient root certificates store and nothing reported security problems with the connections if there is a problem with your security certificates it would interfere with some browsers, and would block a program relying upon the systems certificate store for htttps certificate validation and it's not related to you firewall. I cannot help resolve this as you don't mention what version of windows you are using and what web browsers you have had problems with connecting to this vendors site. Different websites use different certificating authorities so could just be a matter of chance that have not experienced this with other sites, yet. You could also post what the certificate chain reports for you... and that can be compared with what others have... there are Certificate store malware attacks out there that can replace legitimate certificates with bogus ones to enable data harvesting attacks by setting up false websites and certificates... and redirecting your access to their bogus sites to harvest login details and other sensitive information.
This is not the best medium to resolve deep system problems like yours.
TK

TK, That's interesting. I've tried current versions of Firefox, Edge, Opera, and the Epic privacy browser, and all fail to connect to this vendor's site with ERR_SSL_PROTOCOL_ERROR errors. I'm on Win10 Pro and Win11 Pro and have the same issue on both computers, and on neither computer do I have a problem accessing other sites or software, nor am I being redirected to phishing or other bogus sites. It's hard to quantify this as a "deep system problem," since it seems to have affected my access only to this vendor's site and software so far, but it is mysterious.

TK, Thanks for bringing this issue to my attention.

David Bookbinder, ok, what's the common connection with the problem connection? ERR_SSL_PROTOCOL_ERROR errors suggests it's not the computers as you've tried two different operating systems, on different filesystems with various browsers, while it is conceivable both systems on the same LAN could be infected with the same malware I'm more inclined to suspect the router or some common network configuration. One thing I believe you have not tried is smart phone access using the mobile data and not your LANs WiFi if that succeeds then try again using your LANs Wifi an not mobile data and if that fails you have the answer where the problem lies your router is in some way interfering with the SSL protocol or a system VPN or proxy... some part of your LANs infrastructure would be causing the problem. Don't worry you are not missing much, the program is in my opinion not very useful as one has to apply the selected filter to the entire image whether you want to or not unless you have a compatible 64bit editor and can select just the area to be filtered and pass that to the program as a 64bit Photoshop plug-in.
TK

TK, Found it. When Chrome wouldn't support uBlock Origin, I briefly installed AdBlock desktop on my computers. It changed the DNS to its servers and they blocked the site. Fixed, though it took a couple of wasted hours to figure that out. Uninstalling should have reset the DNS but didn't.