Sorry, I meant "source code version", not "open source" I found the issue! Something got corrupted or I did something wrong, when I ran the TeeInstall.exe the first time. When I ran it it asked if I wanted to back up the data. I made a copy the Studio\21.0 folder and continued. I just restored this ...

Yes, I decided to try the source code since the normal one wasn't working.
We have one teammate who successfully installed the source code version, I am the first to use the regular version. Should I have him try to install the normal version as well, or could that cause issues?

Nope, I tried running as admin. Same Error.

Yes, that path is in the registry and points to the 10.4 version of Delphi.

I got a "Can't Load package" error so I did as instructed and copied the two "TeePro927.bpl" files to SysWOW64 and System32 folders. I still get the exact same error. I see the 924 files were already there, does that provide any hints?

I am trying to install using the source code. (TeeChartVCLFMXSOURCE-2021.33.exe)

However, the option only shows 10.1 Berlin version even though I have 10.4 Sydney installed. How do I get it to have Sydney install option or are there instructions to modify for 10.4.

Yes, those packages are there.

I tried moving the exe to the "Delphi27.win32" folder , and got the same error.

Delphi Sydney Install version 2021.33 I am getting the following error when installing. (Install Error1.jpg) Install Error1.jpg I let it finish and tried to install "TeeInstall.exe" and it also gave an error "TeeChart files cannot be found under current folder structure" (InstallError2.jpg) Install ...