cannot install veeam agent - OpenSSL v3.0.0 FIPS issue

There is something leftover on your system that Veeam is detecting via the Registry.  Try this to see if it fixes the issues - run the PS command to get the GUID for the PSChildName and then uninstall any residual components via MSIEXEC.

$paths = @(
    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall",
    "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall"
)
foreach ($path in $paths) {
    Get-ChildItem $path | Get-ItemProperty | 
    Where-Object { $_.DisplayName -like "*Veeam*" -or $_.DisplayName -like "*OpenSSL*" -or $_.DisplayName -like "*FIPS*" } |
    Select-Object DisplayName, DisplayVersion, PSChildName
}


# Replace {GUID} with the IdentifyingNumber/PSChildName from above
msiexec /x {GUID-HERE} /qn

There is something the installer is detecting on the machine causing the errors and failed install.

note: the registry entries do not exist on my system.

thank you for taking time to write the custom script on-the-fly. most impressive.

however this is no output, as run on the command line and inside notepad++

so, i added the following line to make sure there was some output
“write "thanks Chris.Childerhose!"

so here is the output

NPP_SAVE: d:\iso\veeam\vagent\13\doit.ps1
CD: d:\iso\veeam\vagent\13
Current directory: D:\iso\veeam\vagent\13
powershell.exe -ExecutionPolicy Unrestricted -NoLogo -File "d:\iso\veeam\vagent\13\doit.ps1"
Process started (PID=1000) >>>
thanks Chris.Childerhose!
<<< Process finished (PID=1000). (Exit code 0)
================ READY ================

Ok then unsure what to suggest now other than contacting Support.  There is something the installer does not like.

Did you check the Add/Remove Programs for anything Veeam and remove it?  Just a thought.

so in the past, my laptop was connected to a VBAR server running over tailscale.
for five years, all was great.

yesterday, i remove my laptop from the VBAR.
using VBAR, i uninstalled the veaam agent and removed the license.
rebooted my laptop.

now, i am trying to install standalone veeam agent free edition and getting the above error

So then my guess is there are remnants from the VBAR install somewhere that need to be cleaned up.  Check in the Add/Remove Programs for FIPS and remove it as well as any other Veeam items.