How to use letsdowngrade

gistfile1.txt

    @interface letsdowngrade : NSObject
    - (id)init;
    - (void)performAppInstallFromBundleId:(NSString*)bundleID externalIdentifier:(NSString*)externalIdentifier promptDeletion:(BOOL)prompt;
    @end


How to use in tweak:

    void *handle = dlopen("/Library/MobileSubstrate/DynamicLibraries/letsdowngrade.dylib", RTLD_NOW);
    if (!handle){
        letsdowngrade *letsdowngrade = [[NSClassFromString(@"letsdowngrade") alloc] init];
        [letsdowngrade performAppInstallFromBundleId:@"com.burbn.instagram" externalIdentifier:@"837506065" promptDeletion:NO];
    }
    dlclose(handle);
    
    
Note: if you use promptDeletion, downgrade will only proceed if the app is deleted by the user. 
Also, you can find externalIdentifiers here: https://mixrank.com/appstore/apps/389801252/versions