In KB75956 appears the following information about agent build 188.8.131.5235 (MA 4.6 Patch 2 repost)
"Alternatively, if you attempt to install MA 4.6 Patch 2 Repost (build 184.108.40.20635) and the installation fails and rolls back for any reason, you might be impacted by this issue.
The MA 4.6 Patch 2 Windows Repost (build 220.127.116.1135) contains a fix for the basic uninstallation code, but the issue could still occur with that build in a rollback scenario.
The question is: if version 18.104.22.16818 (agent 4.6 P2) has not been deployed, is it necessary to apply the KB75956 fix before upgrading from 22.214.171.12435 to 126.96.36.19922?
If version 188.8.131.5218 (agent 4.6 P2) has not been deployed, then there is no need to apply the KB75956 fix,
You can simply upgrade the MA to version 184.108.40.20622 or 4.8.