I've now completed my first round of testing, attempting to upgrade Dynasty v. 135.01 via direct downloads from Github (i.e., not using the downloader pref pane, which I have not yet reinstalled - also FWIW, these downloads were all accomplished in Pale Moon, from which I am also posting this reply). I have the following results:
Version 136.01: downloaded, installed (by replacing/overwriting the older version), and launched without issue.
Version 137.0b5: Downloaded, installed (same way), and launched without issue.
Version 137.02: Here's where it hung up. Downloaded & installed as per the above, but would not launch. By all appearances, same problem as before.
That's where I'll stop for today. More testing to come. Thanks again all!