You could also keep the laptop with XP, and upgrade the Java to 1.8.0_161 (as I recall). Without lots of memory, the newer Windows struggle a bit.??
Although the XP is a security risk if connected to the internet so it is strongly suggested not to go online, updates can still be done by off-line installing using a USB memory stick (download on a different computer, properly updated with protection).
I have my IBM ThinkPad T20 on XP, and have installed JMRI 4.13.5 so far (not my main computer, not seldom comes out of its bag).?
Phil in gorgeous Young Harris, Georgia, USA