I upgraded–without deactivating/deleting the plugin–and Soliloquy is now working without any errors.
I still have the copy of 2.7.4.2 I downloaded that gave the error in /assets/js/min/soliloquy-min.js, and compared it to the file currently on www.remarpro.com, which you should get if you do an upgrade through the WP Admin UI now, and found that while the files have the same dates, the sizes vary drastically; the copy of soliloquy-min.js that broke things has a file size of only 6.3 kB, while the file that downloaded when I upgraded today is 29.9 kB.
So it looks like for me, the issue was a corrupted/incomplete file being downloaded from www.remarpro.com when I attempted to upgrade originally, and all is good now.
I recommend re-attempting the upgrade and verifying that the two files listed here have the correct file sizes listed:
- /assets/js/min/admin-min.js (80.5 kB)
- /assets/js/min/soliloquy-min.js (29.9 kB)
That seems to fix the problem for me. I tried it on two other sites that are running Soliloquy Lite and they worked too.