I've successfully installed SSDT 2017 on VS 2017. However, we have some older SSIS packages and SSRS reports for which I need VS SSDT 2015.
I have VS 2015 Enterprise installed.
I'm trying to install SSDT 2015 17.3 or 17.4 It fails when trying to acquire packages.
These are last few lines from the install log
It looks like files are missing from the Microsoft server, no?
[1674:10DC][2020-04-01T14:07:16]: Verified acquired payload: VSTALS2015 at path: C:\ProgramData\Package Cache\.unverified\VSTALS2015, moving to: C:\ProgramData\Package Cache\4F812BBB2BE7E30CED293F8A229A5410D70DE6DB\payload\x86\vsta_ls.exe.
[1080:26EC][2020-04-01T14:07:16]: Prompt for source of package: VSTASetup2015, payload: VSTASetup2015, path: C:\Users\03751\Downloads\payload\x86\vsta_setup.exe
[1080:26EC][2020-04-01T14:07:16]: Acquiring package: VSTASetup2015, payload: VSTASetup2015, download from: https://go.microsoft.com/fwlink/?LinkId=817280&clcid=0x409
[1080:26EC][2020-04-01T14:07:16]: Error 0x80070002: Failed to send request to URL: https://go.microsoft.com/fwlink/?LinkId=817280&clcid=0x409
[1080:26EC][2020-04-01T14:07:16]: Error 0x80070002: Failed to connect to URL: https://go.microsoft.com/fwlink/?LinkId=817280&clcid=0x409
[1080:26EC][2020-04-01T14:07:16]: Error 0x80070002: Failed to get size and time for URL: https://go.microsoft.com/fwlink/?LinkId=817280&clcid=0x409
[1080:26EC][2020-04-01T14:07:16]: Error 0x80070002: Failed attempt to download URL: 'https://go.microsoft.com/fwlink/?LinkId=817280&clcid=0x409' to: 'C:\Users\03751\AppData\Local\Temp\{e00b8ed8-7335-41ce-8fb4-3cce8107d2c8}\VSTASetup2015'
[1080:26EC][2020-04-01T14:07:16]: Error 0x80070002: Failed to acquire payload from: 'https://go.microsoft.com/fwlink/?LinkId=817280&clcid=0x409' to working path: 'C:\Users\03751\AppData\Local\Temp\{e00b8ed8-7335-41ce-8fb4-3cce8107d2c8}\VSTASetup2015'
[1080:26EC][2020-04-01T14:07:16]: Failed to acquire payload: VSTASetup2015 to working path: C:\Users\03751\AppData\Local\Temp\{e00b8ed8-7335-41ce-8fb4-3cce8107d2c8}\VSTASetup2015, error: 0x80070002.
[1674:10DC][2020-04-01T14:07:16]: Removing cached package: VSTALS2015, from path: C:\ProgramData\Package Cache\4F812BBB2BE7E30CED293F8A229A5410D70DE6DB\
[1674:10DC][2020-04-01T14:07:16]: Removing cached package: SQLAMO, from path: C:\ProgramData\Package Cache\{814F3AD7-D4EC-40A8-A2C0-EEE53C9CD6AD}v14.0.1000.284\
[1674:10DC][2020-04-01T14:07:16]: Removing cached package: SQLASADOMD, from path: C:\ProgramData\Package Cache\{AC12A422-9EDF-4383-B3A3-64B76F86F856}v14.0.1000.284\
[1674:10DC][2020-04-01T14:07:16]: Removing cached package: SSDT14, from path: C:\ProgramData\Package Cache\{D9E5DDD8-FCC9-4CAF-964D-1652C232C00D}v14.0.61709.290\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SSDTEXTERNALS13, from path: C:\ProgramData\Package Cache\{CDED15B3-65CE-4DAD-A602-8F12564E688E}v13.1.4001.0\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SQLSMO13X64, from path: C:\ProgramData\Package Cache\{D5829155-CEBE-4B91-8CDD-642942284ADC}v13.1.4001.0\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SQLSMO13X86, from path: C:\ProgramData\Package Cache\{9C95FAAF-AC2A-45C2-A778-79FBBDD3A59A}v13.1.4001.0\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SQLCLRTYPES14X64, from path: C:\ProgramData\Package Cache\{A825DFF0-A610-49A3-BF7C-C5772A0F488B}v14.0.800.90\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SQLCLRTYPES14X86, from path: C:\ProgramData\Package Cache\{BB1CC3B8-7A05-4566-93D5-68C4EFF24629}v14.0.800.90\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SQLCLRTYPES13X64, from path: C:\ProgramData\Package Cache\{1F4D6A03-93BB-4BA0-9524-DB7CA0B17B24}v13.1.4001.0\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SQLCLRTYPES13X86, from path: C:\ProgramData\Package Cache\{9070F68A-4B84-4AFF-84C2-0BA772E71107}v13.1.4001.0\
[1674:10DC][2020-04-01T14:07:17]: Removing cached package: SQLDOM13X64, from path: C:\ProgramData\Package Cache\{C78CC1C8-D0DF-4F47-BA93-F3AE6E80E047}v13.1.4001.0\
[1080:3264][2020-04-01T14:07:17]: Error 0x80070002: Failed while caching, aborting execution.
[1674:2B5C][2020-04-01T14:07:17]: Removed bundle dependency provider: {e00b8ed8-7335-41ce-8fb4-3cce8107d2c8}
[1674:2B5C][2020-04-01T14:07:17]: Removing cached bundle: {e00b8ed8-7335-41ce-8fb4-3cce8107d2c8}, from path: C:\ProgramData\Package Cache\{e00b8ed8-7335-41ce-8fb4-3cce8107d2c8}\
[1080:3264][2020-04-01T14:07:17]: Apply complete, result: 0x80070002, restart: None, ba requested restart: No
