Here’s a follow-up, now that I’m back from the dentist.
When you have a recent version of Wine, like 7.0, you can right click on the RM installer, and choose the menu option Open with Wine or something like that. I don’t know the actual text, because I run Wine in Dutch, so my text is different.
For RM 8, you don’t need to do anything more than following the next steps, by accepting the choices offered by Wine to install extra components, like Gecko, and Mono, and whatever it thinks that you need. There is only one exception in the process, which is that you don’t need the Browsing enhancement offered by the RootsMagic installer itself.
Then, when you run RM 8, you will probably see a red blob, where you would normally see a checkmark, to acknowledge that you’ve read the latest news. You can prevent that by running winecfg, by typing that in the terminal, and installing GDIplus. That’s in the 2nd, and again, I can’t give you its name.
Before you do that, you may also need to set the Windows version to 10, in the 1st tab. You need that, to make sure that you have a cursor in all sorts of windows, like the one where you type your FamilySearch name and password.
I have Wine 6.0 on my laptop, and on that, there does not seem to be a way to run the installer by right clicking on that in the Downloads folder. And that’s why I use winetricks. That has an option that says Run Uninstaller, and when you run that, you will see a window that lists programs that are already installed, but which also has an option to install a program, in which you select the .exe file that you downloaded.
For RM 9, most of the instructions are the same, except that you also need to copy the DLL mentioned earlier in this thread. I copied that from a Windows 10 installation.