HP50g ROM Upgrade / Downgrade Question

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Funny coincidence, I decided to start using my 50G again after a very long hiatus. I upgraded from 2.05 to 2.15, then back down to 2.10, all with the Connectivity Kit and Win 10. No problems, no data lost. Although the bit about holding [+] and [-] simultaneously, while pressing RESET in, is a bit of a gyration.

I downgraded from 2.15 to 2.10 to get rid of the SmartStream (StreamSmart?) app that automatically installs with 2.15. According to the description at hpcalc.org, the only difference between 2.10 and 2.15 is that app. But really, I need to learn how to delete apps ...