I currently have the lewd version of the app with the mod. Here were the steps that worked for me:
1) Install from store, ideally using the referral link from earlier in the thread or from an ad.
2) Open game, if the voice lines prompt doesn't pop up (and if the tutorial level isn't notably lewd), then you have the sfw version. Exit the game, and clear the cache and data for the app.
3) Reopen the app, it should hopefully reopen to the lewd version. If not, repeat these steps until the lewd version is installed.
4) Play the lewd version for several minutes; I went through a few rounds until the tutorial tips stopped appearing.
5) Uninstall the game. Install the modded version.
6) If it worked, it should reopen into the lewd tutorial and spending gold on chests or upgrading gifts won't be deducted from your total. Diamonds earned this way can be spent on chests, but are not usable to download the video clips.