When I install and run it from the itch.io application, the application appears to be running but does not open. what is the reason? (i will try directly download through website this time ) . and another problem; during the installation windows defender caught 2 trojans and a backdoor called win32/Bladabind!ml. does this cause a problem about the security of my device? (interestingly I did not get any virus detection when I scanned the same files in virustotal).
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You can try to run it directly from the folder (cogwheel next to launch button -> manage -> open folder) and then double click invokeai_starter.exe.
After that, you should have a desktop shortcut to run it.
(I don't really know why itch takes so weirdly long to launch it. :/ Maybe it is checking if all files are there, which could take a while for 21 GB.)