LASIM author here, ironically on my own alt: Just an FYI that support for Lemmy 0.18.3 is not yet out, but keep an eye out for it soon (I have it working on a branch but I need to test it more before release).

This is the first breaking API change since it's creation, so here are the limitations:

• Old version (0.1.2) will only support API 0.18.1 and 0.18.2
• New version (0.2.0) will only support 0.18.3 (and above until there are more breaking API changes)
• Profiles downloaded with 0.1.2 (and below) will automatically be converted to work with 0.2.0.

So that all means:

• You can use the old LASIM to migrate between 0.18.2 Lemmy instances
• You can use the new LASIM to migrate between 0.18.3 Lemmy instances
• You can use the old LASIM to download from an 0.18.2 instance then use the new LASIM to upload to a 0.18.3 instance
• You cannot use the new LASIN to download from a 0.18.3 instance and then the old LASIM to upload to a 0.18.2 instance (unless you are comfortable doing some manual work editing the JSON file so "old LASIM" understands it).

This will be true of every release with breaking API changes.

EDIT: PR is out. Once it builds, I'll publish a new release! https://github.com/CMahaff/lasim/pull/21

EDIT 2: Release is published! https://github.com/CMahaff/lasim/releases/tag/v0.2.0