Hi @Patrick30! As you are new to the community, when you get a chance, please introduce yourself here.
1/2/3. You should be able to install ODK-X Sync Endpoint on your own server, see custom database instructions here: ODK-X Sync Endpoint — ODK-X Docs
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You can use suitcase to download from whatever address, see ODK-X Suitcase — ODK-X Docs
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I am not sure the details for cloud services that aren’t documented, but the general pre-reqs are here: ODK-X Sync Endpoint — ODK-X Docs
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The ODK-X tools are compatible with Aggregate v1.4.15 and are no longer recommended. See details ODK Aggregate Tables Extension — ODK-X Docs