Update from iMac High Sierra (10.13.6) to Mojave
Can I opdate my Mac 10.13.6 High Sierra to Mojave?
Question marked as
The model and year of your Mac will determine which macOS you can upgrade to,
read the following link.
How to upgrade to macOS Mojave - Apple Support
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.
If you are considering upgrading to Catalina be warned that it does not support 32bit apps.
Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,
some updates may be free, some may be paid. Use this app to discover which apps you have
are 32bit, https://www.stclairsoft.com/Go64/. Once the list has been created you can then
contact the developers of the apps to see if they provide 64bit updates.