Lart Tooth mod with glitch save game

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I have a problem with the Lard Tooth mod, I tried it, I liked it, and since I was just playing the game I gave it to save before leaving. When I came back and wanted to go in, he didn't let me, until I put on the Lard Tooth mod. Now I want to put another car mod and it won't let me because the game was saved with Larth Tooth already purchased. Is there any way to fix this?

Sorry if something is misspelled, I'm using the translator.