Too late to upgrade from Mac OS High Sierra?
Have 2017 iMac. Never updated OS from High Sierra (some concern/fear due to something we heard of inability to use Adobe audio software early on). Is it too late -- will I destroy my iMac? Is there enough memory on this older iMac to do latest upgrade? Yes I do hard disc back up LaCie on weekly basis. Nervous about attempting update - afraid it will destroy computer. Thanks in advanced for info/help.
iMac 21.5″, macOS 10.13