Roamio without TIVO subscription

Hello..

I have a bunch of shows recorded on my roamio, but that Roamio no longer pays a fee to Tivo. Can I still watch the old shows?

Thanks in advance to this great community.!

My situation:

I have the Roamio OTA (+cable card)-- was about $150-$200 when new.
We had "cut the cord"-- used OTA and a patchwork of streaming (Sling, Hulu, Showtime,) plus Showtime/HBO.. So we paid $15/month to TIVO basically for the OTA recording and "guide" to the 50 OTA channels here (Washington DC)

Finally went back to Cable company (reluctantly)-- RCN locally-- since the "package price" but better live sports (olympics) without the hiccups on Sling and without switching back and forth between TIVO and firestick. Price is equivalent all-in.

Cable company added a $7/month Premiere 2-tuner which is sufficient. (Cable guy asked why not just put in a $2/month cable card in the old Roamio).

Anyway, now we have an extra Roamio. So I'll cancel the $15/month Roamio-TIVO subscription (since it's includled in the overall-cheaper-cable package) The Roamio has maybe 40 hours of programming I hate to lose (but havent watched anyway-- previous operas and Arlo Guthrie shows recorded from PBS, and an Adele concert).

Question #1 -- more important
Can I just plug in the Roamio (without its own TIVO monthly fee) via HDMI to the TV, and watch those recordings? Or is the Roamio "dead" without an additional Tivo monthly fee?

Is there a way to "download" the shows to some external hard drive and play that way?

Question #2. -- less important
We have a 2nd TV in basement we don't use (kids have left home). It only has OTA channels and ROKU. Can I put the Roamio on that TV? would the Cable Company charge me only $2.00 for the Cable Card? Or would I also have to pay TIVO (again) the $15 monthly fee?

Thanks for reading the long post. I posted here since I expect I'll get a more honest response than calling either the cable company or TIVO.

-Steve