Carlos,
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Since version 24.0.xx is not the newest version, did you try just installing it, effectively as an upgrade to your previous version?? It might leave everything in place including your user-provided models.? That is how LTspice upgrades used to work.
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Today, with the latest versions (24.1.x), it probably won't be that simple.? But with 24.0.xx it might be, if you are lucky.? Maybe it's a bit of a stretch since your LTspice IV was quite old and I think the system library area did move when going from that to LTspice XVII.
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Andy
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