Hi Brendon, this is Marshall, just reached out on Twitter.

Makefile

@@ -1,26 +1,32 @@
-ifdef DEBUG
-	ARCHS = arm64
-	TARGET = iphone:clang:11.2
+ifdef SIMULATOR
+TARGET = simulator:clang:latest:8.0
 else
-	ARCHS = armv7 armv7s arm64 arm64e
-	TARGET = iphone:clang:9.2:6.0
+	TARGET = iphone:clang:latest:7.0
+	ifneq ($(debug),0)
+		ARCHS= arm64 arm64e
+	else
+		ARCHS= armv7 arm64 arm64e
+	endif
 endif
 
-
-include $(THEOS)/makefiles/common.mk
-
 LIBRARY_NAME = libcolorpicker
 
-$(LIBRARY_NAME)_FILES = libcolorpicker.mm UIColor+PFColor.m PFColorPicker.m PFColorTransparentView.m PFColorViewController.xm PFColorCell.mm PFColorAlert.m PFColorAlertViewController.xm PFHaloHueView.m PFHaloKnobView.m PFColorLitePreviewView.m PFColorLiteSlider.m PFLiteColorCell.mm PFSimpleLiteColorCell.mm PFColorPickerWelcome.mm
-$(LIBRARY_NAME)_FRAMEWORKS = UIKit CoreGraphics Foundation Social Accounts
-$(LIBRARY_NAME)_PRIVATE_FRAMEWORKS = Preferences
-$(LIBRARY_NAME)_LDFLAGS += -Wl,-segalign,4000
-$(LIBRARY_NAME)_CFLAGS = -fobjc-arc
-PFColorAlert.m_CFLAGS = -fno-objc-arc
-PFSimpleLiteColorCell.mm_CFLAGS = -fno-objc-arc
-PFLiteColorCell.mm_CFLAGS = -fno-objc-arc
+libcolorpicker_FILES = libcolorpicker.mm UIColor+PFColor.m PFColorAlert.m PFColorAlertViewController.xm PFHaloHueView.m PFHaloKnobView.m PFColorLitePreviewView.m PFColorLiteSlider.m PFLiteColorCell.mm PFSimpleLiteColorCell.mm PFColorPickerWelcome.mm PFSimpleLiteColorCell_.mm
+libcolorpicker_FRAMEWORKS = UIKit CoreGraphics Foundation Social Accounts
+libcolorpicker_PRIVATE_FRAMEWORKS = Preferences
+libcolorpicker_LDFLAGS += -Wl,-segalign,4000
+libcolorpicker_CFLAGS = -fobjc-arc -Wno-error=deprecated-declarations
+PFColorPickerWelcome.mm_CFLAGS = -Wno-deprecated-declarations
+
+include $(THEOS)/makefiles/common.mk
+include $(THEOS_MAKE_PATH)/library.mk
 
 after-install::
 	install.exec "killall -9 Preferences"
 
-include $(THEOS_MAKE_PATH)/library.mk
+setup::
+	@[ -f $(SIMULATOR_ROOT)/usr/lib/$(LIBRARY_NAME).dylib ] || sudo ln -s /opt/simject/usr/lib/$(LIBRARY_NAME).dylib $(SIMULATOR_ROOT)/usr/lib/$(LIBRARY_NAME).dylib || true
+	@[ -f $(SIMULATOR_ROOT)/usr/lib/$(LIBRARY_NAME).dylib ] || echo -e "\x1b[1;35m>> warning: create symlink in $(SIMULATOR_ROOT)/usr/lib yourself if needed\x1b[m" || true
+
+remove:: 
+	@sudo rm -f $(SIMULATOR_ROOT)/usr/lib/$(LIBRARY_NAME).dylib

PFColorAlert.m

@@ -21,7 +21,7 @@ @interface PFColorAlert ()
 @implementation PFColorAlert
 
 + (PFColorAlert *)colorAlertWithStartColor:(UIColor *)startColor showAlpha:(BOOL)showAlpha {
-    return [[[PFColorAlert alloc] initWithStartColor:startColor showAlpha:showAlpha] autorelease];
+    return [[PFColorAlert alloc] initWithStartColor:startColor showAlpha:showAlpha];
 }
 
 - (PFColorAlert *)initWithStartColor:(UIColor *)startColor showAlpha:(BOOL)showAlpha {
@@ -44,7 +44,7 @@ - (PFColorAlert *)initWithStartColor:(UIColor *)startColor showAlpha:(BOOL)showA
     if (@available(iOS 13, *)) {
         NSSet<UIScene *> *connectedScenes = [[UIApplication sharedApplication] connectedScenes];
         UIScene *firstScene = [[connectedScenes allObjects] objectAtIndex:0];
-        self.darkeningWindow = [[UIWindow alloc] initWithWindowScene:firstScene];
+        self.darkeningWindow = [[UIWindow alloc] initWithWindowScene:(UIWindowScene*)firstScene];
         self.darkeningWindow.frame = winFrame;
     } else {
         self.darkeningWindow = [[UIWindow alloc] initWithFrame:winFrame];
@@ -62,7 +62,7 @@ - (PFColorAlert *)initWithStartColor:(UIColor *)startColor showAlpha:(BOOL)showA
     if (@available(iOS 13, *)) {
         NSSet<UIScene *> *connectedScenes = [[UIApplication sharedApplication] connectedScenes];
         UIScene *firstScene = [[connectedScenes allObjects] objectAtIndex:0];
-        self.popWindow = [[UIWindow alloc] initWithWindowScene:firstScene];
+        self.popWindow = [[UIWindow alloc] initWithWindowScene:(UIWindowScene*)firstScene];
         self.popWindow.frame = winFrame;
     } else {
         self.popWindow = [[UIWindow alloc] initWithFrame:winFrame];
@@ -82,10 +82,10 @@ - (PFColorAlert *)initWithStartColor:(UIColor *)startColor showAlpha:(BOOL)showA
     [self.darkeningWindow makeKeyAndVisible];
 
     self.popWindow.rootViewController = self.mainViewController;
-#ifndef DEBUG
+
     self.darkeningWindow.windowLevel = UIWindowLevelAlert - 2;
     self.popWindow.windowLevel = UIWindowLevelAlert - 1;
-#endif
+
     self.popWindow.backgroundColor = UIColor.clearColor;
     self.popWindow.hidden = NO;
     self.popWindow.alpha = 0.0f;
@@ -115,8 +115,6 @@ - (void)displayWithCompletion:(void (^)(UIColor *pickedColor))completionBlock {
 
     self.completionBlock = completionBlock;
 
-    [self retain];
-
     [self.popWindow makeKeyAndVisible];
 
     [UIView animateWithDuration:0.3f animations:^{
@@ -128,13 +126,12 @@ - (void)displayWithCompletion:(void (^)(UIColor *pickedColor))completionBlock {
         UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(close)];
         self.darkeningWindow.userInteractionEnabled = YES;
         [self.darkeningWindow addGestureRecognizer:tapGesture];
-        [tapGesture release];
 
-        NSString *prefPath = @"/var/mobile/Library/Preferences/com.pixelfiredev.libcolorpicker.plist";
+        NSString *prefPath = @THEOS_PACKAGE_INSTALL_PREFIX"/var/mobile/Library/Preferences/com.pixelfiredev.libcolorpicker.plist";
         NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile:prefPath];
 
         if (!dict)
-            dict = [[NSMutableDictionary new] autorelease];
+            dict = [NSMutableDictionary new] ;
 
         NSString *kDidShow = @"didShowWelcomeScreen";
         if (!dict[kDidShow]) {
@@ -161,11 +158,7 @@ - (void)displayWithCompletion:(void (^)(UIColor *pickedColor))completionBlock {
 - (void)showWithStartColor:(UIColor *)startColor
                  showAlpha:(BOOL)showAlpha
                 completion:(void (^)(UIColor *pickedColor))completionBlock {
-    UIAlertView *deprecated = [[UIAlertView alloc] initWithTitle:@"libcolorpicker" message:@"Hey! It appears like this preference bundle is trying to use deprecated methods to invoke the color picker and requires an update. Please inform the dev of this tweak about it."
-                                                        delegate:nil
-                                               cancelButtonTitle:nil
-                                               otherButtonTitles:@"OK", nil];
-    [deprecated show];
+
 }
 
 - (void)close {
@@ -185,13 +178,4 @@ - (void)close {
     }];
 }
 
-- (void)dealloc {
-    [self.mainViewController release];
-    [self.popWindow release];
-    [self.darkeningWindow release];
-    self.completionBlock = nil;
-
-    [super dealloc];
-}
-
 @end

PFColorAlertViewController.xm

@@ -22,10 +22,12 @@ typedef enum UIUserInterfaceStyle : NSInteger {
     UIUserInterfaceStyleLight,
     UIUserInterfaceStyleDark
 } UIUserInterfaceStyle;
+#elif __IPHONE_OS_VERSION_MAX_ALLOWED < 120000
+#define UIUserInterfaceStyleDark 2
 #endif
 
-@interface UITraitCollection (iOS12_13)
-@property (nonatomic, readonly) UIUserInterfaceStyle userInterfaceStyle;
+@interface UITraitCollection_
+@property (nonatomic, readonly) NSInteger userInterfaceStyle __TVOS_AVAILABLE(10_0) __WATCHOS_PROHIBITED; // unspecified: UIUserInterfaceStyleUnspecified
 @end
 
 @interface _UIBackdropViewSettings : NSObject
@@ -50,7 +52,7 @@ autosizesToFitSuperview:(BOOL)fitsSuperview
     if (%c(_UIBackdropView)) {
         int style = 2010;
         if (@available(iOS 13, *)) {
-            if ([UIScreen mainScreen].traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark) {
+            if (((UITraitCollection_*)[UIScreen mainScreen].traitCollection).userInterfaceStyle == UIUserInterfaceStyleDark) {
                 _tintColor = UIColor.whiteColor;
                 style = 1100;
             }