Since there's no such manual installation in Selector Mod 7.0.1, I'll be glad to help you install the mod and I'll also consider to put manual installation in 7.0.2 update. Here's what to do:
1. Download IMG Tool 2.0 from this
link2. Extract the ZIP and run the executable file with Run As Administrator.
3. Open the Scripts.img of Selector Mod.
4. Find and extract these following files to any folder that easy to remember:
[-] ClassBiology.lur
[-] ClassGeography.lur
[-] ClassMath.lur
[-] FirstPerson.lur
[-] MGArcade.lur
[-] STimeCycle.lur
[-] Tattoos.lur
5. Close IMG Tool 2.0
6. Go to '../Bully - Scholarship Edition/Scripts/' folder
7. Open your current Scripts.img
8. Click Commands > Add
9. Add every single file that you just extracted from Selector Mod's Scripts.img
10. Click Commands > Rebuild Archive
11. Close IMG Tool 2.0
12. Copy SelectorMod folder from Selector Mod's archive to your Scripts folder
13. Done
Since you said you have a lot of mods inside Scripts.img, it's worth to point out that Selector Mod might replace your current STimeCycle mod since this mod still relying on it. The other files that come from Selector Mod such as ClassBiology, ClassGeography, ClassMath, FirstPerson, MGArcade, and Tattoos would not likely to clash with any other mod except
Math BOT which replaces ClassMath file.
Also, thank you for using Selector Mod 7.0.1, I really appreciate it.