Checksums for my unpacked 5.5C files downloaded 29.02.2021 follows:
PhoenixMiner.exe:
SHA1 11428C3BDF728860FD057C411A95B14E13F05DBC
SHA256 599393E258D8BA7B8F8633E20C651868258827D3A43A4D0712125BC487EABF92
EIO.dll:
SHA1 6DC4A9A58119472B986D896E8E367C7E4BF99477
SHA256 287E44F5067A4E770E8A0605F5720D3D1477ECC4AA4F3A26CE5D3A489AE79780
EIO.exe:
SHA1 8CDA60AC00BC66EF05BB9D96E18206D34CE46B11
SHA256 402438684406D1E3B2D1D5629151259AD864FFC55C8E6AB176F4C47C543D4FEE
IOMap64.sys
SHA1 5193B3BF50E5F9D6340398D045EA93574378763D
SHA256 AD20E44954960278AD965B05E8C67D9D314C200809B99B1B5A219A916CE06B21
check the sums of the exe, dll, EIO and IOMap64 files, they must match these.
you can check the sha amount here:
https://md5file.com/calculator. Just upload there there one by one PhoenixMiner.exe, EIO.dll, EIO.exe: and IOMap64.sys.
You should have the same amounts as those I indicated above.