epo onprem upgrade

[Dwee]

Hello,

we have epo onprem (cluster) version 5.10.0 (Build 2428)
Update Installed: Update 10 (2.0.0.1064),

when i tried to download CU 15 it's gone from software catalog or on the product download sites, 

there are only epo service packs, which I don't know  there are two types, epo service pack 1 and service pack 1 update,
my question is do I still need to upgrade first to CU 15 or can I go straight to service pack 1,
and if you can go straight to SP 1, which one should I install first? the order of how to upgrade can you please describe

[ChrisQ]

According to the release notes:

ePO 5.10 Service Pack 1 Update (ePO 5.10 SP1 CU): use this package to upgrade from an existing ePO 5.10 server to service pack 1.

ePO 5.10 Service Pack 1 (ePO 5.10 SP1): use this package to install ePO for the first time or use this to upgrade from 5.3.x or 5.9.x and earlier to ePO 5.10 SP1.

So from this I would assume you should use ePO 5.10 Service Pack 1 Update (ePO 5.10 SP1 CU)

[cdinet]

Yes, that is correct and you don't have to already be at cu 15.  KB96141 lists upgrade paths for epo SP1