Sorry for two similar posts, but I am on my way to my nephews house now and just wanted to know if it is possible to install the Sync mod (which says 1.7.10 is the latest supported version) on his 1.11.2 version?
If not, what happens if you have mods already installed and update your Minecraft version? Do you just lose the mods not supported by the new updated version?
Ok, ill try and explain this as thoroughly as i can. In essence, no. if a mod says 1.7.10, it will not work under any circumstance on 1.11. some mods support multiple versions, so you will need to pay attention for that. In very rare cases though, some mods will work on multiple versions, such as 1.7.2 will sometimes work on 1.7.10. if you want to use the sync mod, i recommend you just downgrade to 1.7.10. as there are more mods available for it, still a decent amount of work being done with that version, and you dont have to worry about your version going out of use in a month.
on to your next question, and no. mods are not handled how you think they are. in your .minecraft, there is the "mods" folder. changing what version you are using/updating will not effect the contents of that folder, if you are playing vanilla (no forge installed) then what is in that mods folder does not matter as vanilla does not pull from it. however if you do have forge and you have a mod from an incompatible version (like your sync mod in 1.11) the game will not load.
Also, this is the wrong thread for this kind of thing. please use this for any future questions.
I hope this helped, and i will try and answer any other questions you have.
Yes, that is how it works, little tip though, make a second world. one "current world" and then a "modded world" it should minimize any problems you might have. also, in your .minecraft if you make a copy of the "saves" folder, you will have a backup in case anything goes wrong, such as loading a 1.11 world in 1.7.its always a good idea to have a backup. Good luck!