If KRNL-Injector failed to find the Roblox process, delete KRNL App data and see. If that doesn't help follow the solutions mentioned in this post to resolve the issue.

(Arceus X or others)Some other executors include: krnl, Fluxus, Script-Ware, Script-Ware M, and Synapse Once the download is complete, install the Roblox Executor and open and log into it using ...

Delta Executor is a script executor that lets you modify Roblox. Most antivirus flag the Delta Executor file as a virus. Read this post for details.