sg2002

RSSOwl is based on Eclipse RCP, it has a component that deals with encryption, that component didn't have a 64 bit version for a really long time.

No. What you have to understand is that those generators are not free for a reason - generating RSS from html is extremely hard. And even if you buy a subscription to one, there's a high chance that it would be useless for you particular site.

What version of java the Win 10 system is running? Also try the procedure described here.

It means that Rssowl has a problem with a particular feed. Can you try the procedure described here?

Probably the first.

Have you tried launching that downloaded XulRunner manually? Does it work?

Your call. Just FYI updating those files actually makes you Java more secure, not less. Due to US law SUN/Oracle was/is prohibitted from providing the most secure encryption algorhitms. Those files unlock them. Also note that those downloads are from Oracle official website.

Ok. Can you try installing xulrunner manually, as described in as described in the FAQ? Also, do you still get an error with xulrunner when you launch it manually or it works?