first, sorry for my English
According to documents, I will upgrade moodle 2.9+ to moodle 3.1 after that upgrade to 3.5. but before starting to upgrade, I must know all of steps and risks that will happen after upgrading (for presenting to my manager) and know solutions. my server has not internet access and i can't upgrade automatically and forced to upgrade manually. fallowing items are some of my guess that will happen:
1- I'm using Srce 2.2 - Universal Design Theme that there is not newer version at the moodle site, so I will see error in plugin page. I think i must to download another theme related to version 3.1 and locate in theme folder, and in the setting page must change theme. Am i right?
2- the format of all courses is "Menutopic format" and there is not newer version to replace and in database at table 'mdl_course' column "format" is menuetopic , after upgrading, moodle dosen't know menutopic because version of this plugin is not compatible with new version, so will see error message! how must I fix this issue?