Glad you got the subscript error resolved with the latest version. The latest version also gives you access to the Nationwide frequencies in the RRDB.
Erm, okay he never told me the LTR issue was a "firmware" bug. He is right that there won't be any further firmware updates from RS for that model, it was only produced for about a year and any support for it has long since been abandoned.
What I've done with LTR systems is to enter them in ARC160, upload them to the scanner, then rekey the TGID in the scanner. It's a bit of a hassle, but at least it saves you the time of having to manually key alpha-tags into the scanner. Just key the TGID right over the one that ARC160 uploaded, and that will correct the situation.
Enter TGID over top of existing entry (001001 for example) > ENT/PGM > UP ARROW
Repeat the above until you've gotten through all the TG's
Once you've done that, it's probably a good idea to uncheck those banks in the ARC160 upload so you don't have to repeat it. Adding one or two TG's/alpha tags manually isn't too big a deal going forward.