Would using LEGACY Sigil temporarily be detrimental to my epub files?

[graycyn]

My Dell XPS-8930 is very, very sick. It may or may not continue to work. Sometimes it boots, sometimes not, and I have to shut down via power button, wait a bit, turn back on and cross fingers. Even my Windows activation has disappeared.

I'd replace immediately, except, a similar style tower PC, one that can accommodate all my assorted peripherals like flatbed scanner, document scanner, pen display graphics tablet, printer, etc... is now WAY EXPENSIVE!

So, I'm thinking to limp along UNTIL BLACK FRIDAY SALES with my old, and somewhat shaky, Win 7 box. It fires up (fingers crossed this continues) and I've today put legacy Sigil 1.9.30 on it.

What I want to know, is would editing epub 3s in this older version of Sigil adversely affect my files in any way? I can't think why it should, but I'm no expert!

I realize I may have to do without some plugins. I figure I can ask about those on their individual threads at need.

Thanks for reading, and I hope the answer is that I can keep working.