Set Inno Setup installer version based on an online file - inno-setup

Question

In my Inno Setup project, I download all files from the server and also download a file that has a version number. Now I want to read the version from the file and assign it to [Setup] section AppVersion in the Code section. My question is that possible to set the app version in the Code section?

Answer 1

Combining these two questions:
How to set version number from Inno Setup Pascal Script
Inno Setup - HTTP request - Get www/web content
[Setup]
AppVersion={code:GetAppVersion}
[Code]
var
Version: string;
function GetAppVersion(Param: string): string;
var
WinHttpReq: Variant;
begin
if Version = '' then
begin
WinHttpReq := CreateOleObject('WinHttp.WinHttpRequest.5.1');
WinHttpReq.Open('GET', 'https://www.example.com/version.txt', False);
WinHttpReq.Send('');
if WinHttpReq.Status <> 200 then
begin
Log('HTTP Error: ' + IntToStr(WinHttpReq.Status) + ' ' + WinHttpReq.StatusText);
MsgBox('Cannot obtain version', mbError, MB_OK);
Abort();
end
else
begin
Version := Trim(WinHttpReq.ResponseText);
Log('Version: ' + Version);
// you may want to validate that the value is meaningful here
end;
end;
Result := Version;
end;