Offline Wiktionary Format
I am using English Wiktionary Exports wikt-en-en-2018-10-07.7z.
But the format is different, so it is a little difficult to read.
Can you make it look similar to Online Wiktionary?

Currently, there is no support for this. These stardicts are probably not well made enough to display correctly.
A better solution is to create your own dictionary based on the json dumps at https://kaikki.org/dictionary/
I have previously made a Russian wiktionary in JSON format which would output very similar things, and in the near future I plan to start a separate project (which can be included in this one to parse those dumps) to create stardicts from the dumps.
By the way, check out this page for resources you can download. There should be plenty of other dictionaries available for most languages. Note DSL is supported in your beta version.
I got so many json errors when importing the file how to fix it automatically since I am not programmer?
If you mean the kaikki.org dump: It isn't supported yet, so it won't work A new link to that resource page is here: https://docs.freelanguagetools.org/resources.html
Implemented as support for files from kaikki.org, will be present in 0.12.