Kindly get in touch with ImageCraft (email@example.com), as Cypress does not distribute licenses for ImageCraft C Compiler any more. You can also try opening and saving the project in PSoC Designer 4.4. Subsequently open and save the project in PSoC Designer 5.0, and then finally in PSoC Designer 5.4.
Thank you Sampath... Fortunately, a colleague discovered a more recent project that opens in Designer 5.4... after editing my Win10 registry for 8.3 files (per guidance on this forum) and installing Adobe SVG Viewer 3.0 (also found posted to the forum, thank you), I am now working in v5.4 without need of reverting to older build environments. Sure glad I wasn't the only one to have had troubles running the older tools on Win10. I'll mark this as answered - it assumes readers will see this text as it doesn't actually solve the missing ImageCraft license (I did not need to try emailing them, but notable their web site seems to be dead in the water). Many thanks to the Community.
<edit> should also add that I had to uninstall then reinstall Designer v5.4 in a 8.3 compatible location (I chose D:\psoc\psoc5p4) and also moved my project to 8.3 directory name (D:\psoc\fw7793) to make everything happy (this after changing the registry to allow 8.3 file name usage in Win10).</edit>
Thanks Mark for your tip on 8.3 compatible location.